Is Apple silently fixing the iPhone 4 antenna issue?

July 13, 2010 Hardware — Kyle

Reports started surfacing today that Apple may have quietly revised the iPhone 4 to add a nonconductive coating to the metal band on the sides of the phone. This would fix the sudden signal drop from electrically bridging the antennas by touching the band in the bottom-left corner with your hand.

We got an independent report of a similarly updated phone from a member of our community, so we decided to investigate. We exchanged one of our units (that had been experiencing unrelated problems with its Bluetooth connection) to see if Apple has changed the manufacturing process since their initial production run.

The serial number on the unit tells you the manufacture date; our original phone was manufactured in mid-June (week 25). The replacement unit we got was made in early-July (week 27), apparently too soon for a manufacturing change.

The serial number also identifies which factory it was made in. (We don’t have a mapping of numbers to physical factories, but we can tell if two phones came from the same plant.) Apple has always done this, and we’ve occasionally had fun comparing Macs to see if they were birthed in the same place. A fun aside: I once had a Mac made in Apple’s Elk Grove, California factory. This information may be useful if Apple is rolling the production change out to their factories one at a time.

The iPhone 4 serial number is easy to decode! It’s in this format:

aabccdddeef
aa = Factory and Machine ID
b = Year
cc = Production Week
ddd = Unique Identifier
ee = Colour
f = size

Our serial numbers:
85025xxxA4S (16GB unit we took apart)
86025xxxA4T (32GB test unit)
86027xxxA4T (32GB replacement)

Apple has so many iPhones out in the field that it’s very hard to get a feel for what’s going on. They may have just switched to their new process at one of their factories, or they may be rolling it out slowly, or this may be an internet myth. The only way to find out is to check a number of units that have just shipped from the factory.

We need your help! If you got an iPhone in the last few days, check the serial number. If the production week is bigger than 27, try checking the impedance of the metal frame with a multimeter. If you hold the leads about an inch apart, the resistance should be less than one ohm. If it’s substantially higher, you may have a unit with the new coating. (Accuracy of multimeters varies dramatically, but we’d expect a nonconductive coating to have a very high impedance.)

How to measure the resistance of the iPhone 4's metal edge. Our phone reads 0.6 ohms, or eseentially no resistance.

133 Comments

  1. Hi ifixit team!

    I got my iPhone 4 on June 24 from T-Mobile Germany.
    My phone’s serial no.: 87023xxxA4T (xxx is replacing my unique ID)
    I measured the resistance: 0.1 Ohm

    I can clearly confirm the signal drop issue with my unit when holding it in the lower left corner.

    Regards,

    Andreas

    Comment by Andreas — July 14, 2010 @ 12:48 am

  2. I also have problems with the reception. My Serial no. is 87027XXXA4T
    I got it on July 9 from T-Mobeil Germany

    Comment by Ralf — July 14, 2010 @ 1:12 am

  3. Here a 86027xxxA4S phone. I notice the signal bars dropping, but no disconnections so far.
    Using it in the Netherlands on a Vodafone network, bought in the UK.

    Comment by Harm — July 14, 2010 @ 1:47 am

  4. [...] iFixit geht davon aus, dass das Antennen-Problem nur bei iPhones zu finden ist, die in bestimmten Fabrikationswochen bestimmte Fabriken verlassen haben. (Apple lässt derzeit geschätzte 2,5 Millionen Einheiten pro Monat in verschiedene Fabriken fertigen.) [...]

    Pingback by Zwischenstand: iPhone 4 Antennen Problem | BENM.AT — July 14, 2010 @ 2:15 am

  5. [...] zprávu vydali i iFixit . Share and [...]

    Pingback by Apple možná vyrábí nový iPhone 4 — July 14, 2010 @ 2:37 am

  6. [...] 原文跳转> 如喜歡本文|請分享給夥伴 Tagged with: antenna • iPhone • iPhone 4 • 天线  [...]

    Pingback by 苹果公司对iPhone 4 “天线门”事件不做表态? — July 14, 2010 @ 2:53 am

  7. [...] han recubierto el acero inoxidable con algún tipo de capa aislante.En iFixit también han recibido comentarios de un lector que dice que su nuevo iPhone ha mejorado los problemas de cobertura. Así que para comprobarlo, [...]

    Pingback by ¿Está Apple ya fabricando iPhones sin problemas de antena? | AppleWeblog — July 14, 2010 @ 2:56 am

  8. Serial : 87023XXXA4T
    Bar Drop, but no problem with reception.

    resistance: 0.001 kOhm

    Comment by eddi2001 — July 14, 2010 @ 3:22 am

  9. German iPhone like above

    Serial: 84026XXXA4T

    Bar drop, but no problem with reception

    resistance: 0.001 kOhm

    Comment by eddi2001 — July 14, 2010 @ 3:34 am

  10. 88028xxxA4S, 0 Ohm.

    Much better reception than the 3G, though.

    Comment by Ben — July 14, 2010 @ 3:53 am

  11. [...] daadwerkelijk nieuwe iPhones in omloop zijn. Een kleine aanwijzing dat er toch iets aan de hand is, komt van iFixit. Zij ontvingen eveneens een melding van een klant, over een verbeterde versie van de iPhone 4. Na [...]

    Pingback by Geruchten over nieuwe lichting iPhone 4 met coating - iPhone - iPhoneclub.nl — July 14, 2010 @ 4:08 am

  12. 85022XXXA4S

    Problem with reception.

    Comment by Thomas — July 14, 2010 @ 5:04 am

  13. hey guys, post your serial number and resistance value ONLY for iPhone manufactured after week 27 … That what is asked here.

    Quote: ” If the production week is bigger than 27, try checking the impedance of the metal frame with a multimeter. If you hold the leads about an inch apart, the resistance should be less than one ohm. If it’s substantially higher, you may have a unit with the new coating.”

    Comment by luc — July 14, 2010 @ 5:34 am

  14. 85027XXXA4S
    0,6-0,8 Ohm
    Bar drop -2

    Comment by ed — July 14, 2010 @ 5:36 am

  15. 86024XXXA4T
    Bar drop, no dropped calls but echo, unlike neither 3G nor 3GS in the same location.

    Comment by MacDee — July 14, 2010 @ 5:40 am

  16. ohm sweet ohm !

    Comment by nailzuk — July 14, 2010 @ 11:35 am

  17. [...] and iFixit are giving widespread attention to new reports that allege Apple is already revamping its iPhone 4 [...]

    Pingback by Some iPhone 4 Buyers Think Devices Are Already Being Built Differently « AlbaClips Blog — July 14, 2010 @ 12:12 pm

  18. 85027xxxA4T (replaced yesterday): 0.8 -1.3 Ohm, no dropped calls, no bar drop

    Comment by .daz — July 14, 2010 @ 12:14 pm

  19. is it only a problem of devices manufactured in 27 and later, or is 27 and later ok?

    Comment by patrick — July 14, 2010 @ 12:31 pm

  20. I make a lot of things out of stainless steel, as a metal fabricator. The band is made of bright probably free machining stainless steel. Much like aluminum, stainless steel naturally acquires a dull oxide coat after a few days exposure to air. This coating does not conduct electricity very well but protects the metal from corrosion, it’s hard, but it can be scratched(the points of your probes might get through). So what you may be seeing is a natural protective film that develops on the surface. Have you ever noticed when you take the plastic protective wrap off of a new Ipod touch or older model Iphone the metal is super bright, but after a few days, even with the best care has a slightly duller appearance? This is the oxide, it is a good thing. This is why stainless steel is not used for wiring, it is a poor conductor, and it is especially poor at the connection points.

    This problem could just solve itself, and may only be a problem for lefties with particularly sweaty conductive fingers (maybe someone will develop an “app” that can determine who that might be) in which case these folks should get a plastic phone.

    Comment by Solarsculptor — July 14, 2010 @ 12:41 pm

  21. [...] lettore di Gizmodo di aver ricevuto un iPhone 4 sostituito non “difettoso”, il team di iFixit ha deciso di consegnare anche i propri dispositivi al centro assistenza Apple per la sostituzione. [...]

    Pingback by La sostituzione degli iPhone 4 "difettosi" costerebbe 1,5 miliardi di dollari a Apple! — July 14, 2010 @ 12:53 pm

  22. [...] [via Gizmodo, iFixit] [...]

    Pingback by Rumors: New iPhone 4s With Non-Conductive Antennas | iStore4all | Apple News — July 14, 2010 @ 1:03 pm

  23. I’m week 28 and have the problem quite dramatically — at work I go from 5 bars to 1 if I hold the phone in such a way as to bridge the gap; at home I go from 3 bars to 0 and calls become so distorted as to be unintelligible. I’ll verify with an ohmmeter this evening.

    Comment by Egg Davis — July 14, 2010 @ 1:08 pm

  24. 84027xxxA4T
    Measures 0.4 ohms.
    Reception problems: The signal drops just by laying it flat in my hand.

    Comment by Craig — July 14, 2010 @ 1:19 pm

  25. @Solarsculptor

    How many days we have to wait?
    Do you know the resistivity (about) of the insulating layer?

    I can tell you that my hand shows 200-300kOhms normally (with the metal tips at a distance of less than 1cm), but when it’s sweaty it shows 50kOhms.

    I’m italian, i hope you understand me. Bye

    Comment by Simone — July 14, 2010 @ 1:23 pm

  26. Hi iFixit,

    I had a 8 series serial numbered iphone 4 but exchanged it this last weekend due to it dropping itself into recovery mode when left alone for a few hours. The replacement given at the Apple store bears a 7 series serial and still has the same issue.

    Comment by tekwiz — July 14, 2010 @ 1:34 pm

  27. 87023xxxA4S
    I got it on June 24 from T-Mobile Germany.
    measured: 0.2 Ohm

    signal dropping bars (not always), but no disconnects so far

    Comment by Alex — July 14, 2010 @ 1:40 pm

  28. hello,
    i lost my signal bars, too. the iphone production week is 26.
    left+bottom: 0.0 Ohm
    right+bottom: 1.0 Ohm
    left+right: 0.2 Ohm

    Comment by german — July 14, 2010 @ 1:42 pm

  29. I received my iPhone on July 12. The serial number is 88 and 28. Absolutely no problems at all.

    Comment by jjohnson — July 14, 2010 @ 1:52 pm

  30. [...] in news by Cody Fink. It’s questionable whether Apple is silently recalling iPhones, yet iFixit is adamant to find out. Apple PR won’t confirm or deny the issue, so they’d like [...]

    Pingback by iFixit Wants to Confirm the Existence of a Silent Recall — July 14, 2010 @ 1:56 pm

  31. Hey
    I got my iPhone4 on the release day from T-Mobile Germany i think it was the 24.
    my serial no.: 86023xxxA4S ….so my production week is 23.
    I can clearly confirm the signal drop issue with my unit when holding it in the lower left corner.
    Regards,
    Andreas
    Comment by Andreas — July 14, 2010 @ 12:48 am

    Comment by Oliver — July 14, 2010 @ 2:12 pm

  32. Hey
    I got my iPhone4 on the release day from T-Mobile Germany i think it was the 24.
    my serial no.: 86023xxxA4S ….so my production week is 23.
    I have Signal Problems ?!!! sry for my Bad english

    Comment by Oliver — July 14, 2010 @ 2:13 pm

  33. [...] to happen) However, Gizmodo readers are reporting that Apple has fixed the death grip. This would coincide with an iFixIt report. That’s good news given the recent complaints about the Bumper case. The iPhone 4 has been [...]

    Pingback by Daily News Recap (July 14, 2010) | TheMacFeed — July 14, 2010 @ 2:17 pm

  34. [...] anteny. Niestety nikt nie jest w stanie potwierdzić tych rewelacji. Zbadania sprawy podjął się iFixit. Prosi on aby sprawdzić jaką oporność ma ramka w iPhonach wyprodukowanych od 27 tygodnia tego [...]

    Pingback by Blog – iPod, iPad, iPhone, iPhone 3G, iPhone 3GS, iPhone 4 – informacje … » Blog Archive » Jak to jest tymi ulepszonymi iPhonami 4? — July 14, 2010 @ 2:36 pm

  35. [...] Gizmodo is going to be meeting with some of the users who have sent in emails claiming to have a “fixed” iPhone, while iFixit is asking users with recently manufactured iPhone 4s to experiment with a multimeter. We will post more information when / if it becomes available. [Gizmodo, iFixit] [...]

    Pingback by Is A Silent iPhone 4 Recall Already Underway? | Apple Related — July 14, 2010 @ 2:51 pm

  36. Several months back, the rumors were flying that Apple was buying up all the flash memory.

    The latest I’ve heard is that they have purchased Revlon–and have cornered the market on clear nail polish!

    Underpaid, overworked Chinese lower class have been herded into crowded factories where they are laboriously and manually applying a delicate coat across the gap. It works like a charm! No more signal drop, no more grip of death. Just clear, wonderful phone calling.

    Apple has, indeed, fixed the problem quiety!

    Comment by robinson — July 14, 2010 @ 3:14 pm

  37. 88028xxxA4T. I can cause a slight reception loss if I really try to cover the whole lower left side of the phone (including the gap). This is true at the office where I get great reception and at home where I get ok reception. The change is so slight that I can’t be 100% sure that the signal isn’t just naturally drifting a bit. I haven’t dropped a call yet, but it would be very difficult for me to actually hold the phone that way during a regular call. At this point a dropped call would be so infrequent that it would be hard to attribute it to any particular flaw in the iPhone design.

    I have an analog multimeter but I’d say the bezel appears pretty equivalent to just shorting the meter.

    Comment by adunni66 — July 14, 2010 @ 3:36 pm

  38. [...] source: ifixit [...]

    Pingback by Mobile and Gadget Review — July 14, 2010 @ 4:00 pm

  39. [...] ifixit.com [...]

    Pingback by Is Apple fixing the iPhone 4 antenna issue? | Mobile Phone Blog — July 14, 2010 @ 4:42 pm

  40. [...] Et bien pour une surprise, chers amis, c’est une surprise, le site LoopInsight viens en effet d’annoncer que Vendredi 16 Juillet, donc demain, Apple fera une conférence exclusivement consacré à l’iPhone 4. Les invitations auraient été envoyés par Apple ce mercredi. Le site n’en dit pas plus pour le moment, mais on peut s’attendre à des réponses sur les problèmes de réception de l’iPhone 4 et en quelque sorte désamorcer la bombe. Car la pression monte après le lancement d’une « class action » aux USA. Steve Jobs voudrais donc venir faire une intervention devant les journalistes, peut-être aussi pour annoncer le lancement d’une nouvelle vague d’iPhone 4 non « défectueux » comme l’a annoncé iFixit. [...]

    Pingback by Apple lance un Event surprise pour l’iPhone 4 « Cup's Corp. - Stay Tuned ! — July 14, 2010 @ 5:35 pm

  41. CAN YOU DO A DROP TEST ON NEW DEVICE UNIT??

    Comment by test — July 14, 2010 @ 6:04 pm

  42. [...] has so many iPhones out in the field that it’s very hard to get a feel for what’s going on,” iFixit writes. “They may have just switched to their new process at one of their factories, or they may be [...]

    Pingback by Has Apple Already Slightly Changed The iPhone 4′s Design? | apposx.com — July 14, 2010 @ 7:49 pm

  43. 22nd week of production. No problems. Love my iPhone 4!

    Comment by Jana — July 14, 2010 @ 11:02 pm

  44. [...] er rygter fremme om at Apple er begyndt at “coate” de nye serier af iPhone 4, for at undgå antenneproblemet. Det vil med andre sige, at man lægger en belægning uden på det [...]

    Pingback by Apple holder pressekonference fredag om iPhone 4 « Maclounge — July 15, 2010 @ 12:36 am

  45. [...] vrstva, která zamezuje riziku ztáty signálu. Další podobný telefon se dostal do rukou také iFixit.com, který znáte například z našich videí a fotek z rozebírání produktů. iFixit.com [...]

    Pingback by Letem Světem Applem — Server věnovaný společnosti Apple a jejím produktům — July 15, 2010 @ 12:58 am

  46. [...] alcuni iPhone “problematici” con dei nuovi iPhone privi del difetto. Secondo  iFixit e Gizmodo gli iPhone prodotti a partire dalla 27 settimana/2010 non avrebbero più gli evidenti [...]

    Pingback by Apple farà chiarezza sull’antenna dell’Iphone 4 – Riprovaci.it — July 15, 2010 @ 1:53 am

  47. [...] Source : iFixit [...]

    Pingback by Un nouvel iPhone 4 sans problème de réception ? | Journal-iPhone — July 15, 2010 @ 2:03 am

  48. [...] via [...]

    Pingback by Apple sta risolvendo i problemi legati all'antenna iPhone 4 — July 15, 2010 @ 2:38 am

  49. Serial: 7S026xxxA4S
    Got it on July 9th from T-Mobile. Can’t reproduce the bar drops by holding it so that the antennas are connected on the lower left side. If I use both hands and cover the entire frame the signal drops to around 1-2 bars, however I guess that’s to be expected.

    Someone else with the factory number 7 without problems?

    Comment by Xivoo — July 15, 2010 @ 3:14 am

  50. I should add that all my bar drops occur with the bumper applied as well, so there is absolutely no difference in connection strength with or without the bumper. Sadly I don’t have a multimeter to measure the resistance.

    Comment by Xivoo — July 15, 2010 @ 3:20 am

  51. Serial 86028xxxA4T
    I measure about .6 Ohms contact resistance.

    With the phone in the same spot on my desk, I see 3 bars with my hands off drop to 1 bar with my hand bridging the antennas. NOTE: this is after installing the 4.1 beta.
    Bumper case doesn’t work with the charging docks or my car adaptor.
    My Iphone 4 has reception problems in places where my 3G also had problems.
    Reception is not as good as it could/should be, but I don’t see it noticeably worse.

    Comment by Steve — July 15, 2010 @ 3:38 am

  52. [...] Source: iFixit [...]

    Pingback by Il y aurait il des iPhones 4 sans problème de réception? « Technologue — July 15, 2010 @ 3:42 am

  53. [...] Zdroj: iFixit [...]

    Pingback by SuperiPhone.cz » Změnil Apple v tichosti materiál těla iPhonu 4? — July 15, 2010 @ 3:53 am

  54. I have a week 28, Serial 86028xxxxx. I measured 0.6 Ohms I’m also having slight antenna problems. However since I have good reception in my area, it never affected me

    Comment by Omar Abduljaber — July 15, 2010 @ 4:39 am

  55. Update, Lowest I can get it at my house is 3 bars. When I go to low reception areas, I can get it down to 1 bar, but I can still receive calls and talk normally. So no affect for me at all.

    Comment by Omar Abduljaber — July 15, 2010 @ 4:44 am

  56. Hello

    My Phone SN is 85023xxxA4S …
    T-Mobile Germany

    measured: 1.6 Ohm

    [img]http://gallery.me.com/sven_rauer/100714/P1010930_2/web.jpg[/img]

    Comment by Sven — July 15, 2010 @ 5:09 am

  57. @Sven Rauer: Hast du nun Probleme mit dem Empfang, oder nicht?

    Comment by Kirill — July 15, 2010 @ 6:49 am

  58. Nein. Konnte den Fehler noch nicht reproduzieren.

    Comment by Sven — July 15, 2010 @ 6:57 am

  59. [...] The prospects of a recall were approached in the past. Widely downplayed, these are getting some new momentum today as some believe only a recall would justify Apple holding a press conference. Well, the idea of a recall still seems widely exaggerated for now, but not impossible. Also, keep in mind that Apple has already communicated regarding the antenna issue, and addressed it to a certain extent, but without much success satisfying many in the media. This could be why they now feel forced into holding an event in person. However, most people aren’t experiencing any issues with their phones and while Gizmodo has been telling people all about some apparent “silent recall”, nobody has been able to prove it yet. [...]

    Pingback by From Recall To Verizon: Apple Press Conference Tomorrow – What To Expect :: App Advice — July 15, 2010 @ 7:00 am

  60. hello ifixit

    when i did all right, my results are 0,8 ohm. dropping 2 bars when death gripped.
    my phone was one of the first (became my on the first day)and is a “t-mobile” version from germany

    86023xxxxxA4T serial number.

    i mete at left side like you did in the picture above.

    Comment by Martin — July 15, 2010 @ 7:19 am

  61. I dont have any problems, i dont use the stuff from Apple :)

    Comment by fer — July 15, 2010 @ 9:07 am

  62. [...] The prospects of a recall were approached in the past. Widely downplayed, these are getting some new momentum today as some believe only a recall would justify Apple holding a press conference. Well, the idea of a recall still seems widely exaggerated for now, but not impossible. Also, keep in mind that Apple has already communicated regarding the antenna issue, and addressed it to a certain extent, but without much success satisfying many in the media. This could be why they now feel forced into holding an event in person. However, most people aren’t experiencing any issues with their phones and while Gizmodo has been telling people all about some apparent “silent recall”, nobody has been able to prove it yet. [...]

    Pingback by From Recall To Verizon: Apple Press Conference Tomorrow – What To Expect | Apple iPhone News — July 15, 2010 @ 9:12 am

  63. Hi !

    Is this technicaly possible : http://www.macrumors.com/2010/07/15/analyst-claims-design-fix-for-iphone-4-signal-issue-being-deployed/

    An internal fix ???

    Comment by Fred — July 15, 2010 @ 11:08 am

  64. 86027xxxA4T. I can make signal bars dropping, but no disconnections so far. Have meter at home somewhere. I’ll update later if I can find it.
    I got it today (7/15/10) from Apple Store as prior has No SIM and proximity sensors that were persistent.

    Comment by MethodicJon — July 15, 2010 @ 11:50 am

  65. 27. week

    about 0.2-0.5 ohms

    No problems with calls

    Comment by Sime — July 15, 2010 @ 1:37 pm

  66. [...] The prospects of a recall were approached in the past. Widely downplayed, these are getting some new momentum today as some believe only a recall would justify Apple holding a press conference. Well, the idea of a recall still seems widely exaggerated for now, but not impossible. Also, keep in mind that Apple has already communicated regarding the antenna issue, and addressed it to a certain extent, but without much success satisfying many in the media. This could be why they now feel forced into holding an event in person. However, most people aren’t experiencing any issues with their phones and while Gizmodo has been telling people all about some apparent “silent recall”, nobody has been able to prove it yet. [...]

    Pingback by From Recall To Verizon: Apple Press Conference Tomorrow – What To Expect — July 15, 2010 @ 1:55 pm

  67. [...] a chance to test it exhaustively yet (it’s only been a few hours), but I was intrigued by a blog post at iFixIt about how Apple may be applying a non-conductive coating to the metal frame on the [...]

    Pingback by How to decode your iPhone serial number | ZDNet — July 15, 2010 @ 3:18 pm

  68. [...] iFixit, iPhone [...]

    Pingback by Rumors: Apple Secretly Fixing the Antenna Problem | M78 — July 15, 2010 @ 3:19 pm

  69. Important thing to note: the people claiming to have improved phones are pretty consistently saying that their serial numbers BEGIN with 7, so it may be a factory issue. Apparently the 7X factories are lower-output ones owned by Apple. They’ve all been exchanges — apparently the “black box” exchange iPhones generally come from the 7s, and the new-in-box iPhones come from the high-output, outsourced 8s.

    See here for more info:
    http://forums.macrumors.com/showthread.php?t=966251

    I personally have a week 28 device and have both antenna and proximity sensor issues. My phone also DOESN’T have, as is described in that thread, a lighter black front piece, visible proximity sensor, or matte-finish metal — all features of the 7X phones.

    Comment by Kristen — July 15, 2010 @ 3:51 pm

  70. Okay, here’s my iPhone 4:
    I’ve got it on 7th July 2010 on T-Mobile in Germany.
    The Serialnumber is: 7S026xxxA4S

    produced in July (26 KW)

    My multimeter said: between 0.5 to 1.6 ohms.
    Is this good or bad?

    If I hold my finger between the two different atennas, I have transmission stops on websites – I dont tried phone calls, yet.

    :-)

    Comment by DenniX — July 15, 2010 @ 5:24 pm

  71. [...] iFixit geht davon aus, dass das Antennen-Problem nur bei iPhones zu finden ist, die in bestimmten Fabrikationswochen bestimmte Fabriken verlassen haben. (Apple lässt derzeit geschätzte 2,5 Millionen Einheiten pro Monat in verschiedene Fabriken fertigen.) [...]

    Pingback by Ein paar interessante Fakten zum Antennen-Problem des iPhone 4 [Update] « // TBDTTT — July 16, 2010 @ 1:06 am

  72. [...] [...]

    Pingback by Jobs wusste angeblich von Antennenproblematik beim iPhone 4 - Mobile | News | ZDNet.de — July 16, 2010 @ 4:05 am

  73. serial number: 87023xxxA4S
    resistance: 0,2 ohms
    signal bar dropping from 5 to 1 or 2 on 3g (sometimes drops to 1 bar edge!!) when holding it in the lower left corner… by the way: no failed calls or bad speech-quality!

    Comment by martin — July 16, 2010 @ 5:09 am

  74. Hi, i have an T-Mobile Germany Iphone 4 88024xxxA4S! No Problems, everything is ok. It tried the Death Grip, but nothing happends – full bars, besser than every olded Iphone!

    Comment by toppa — July 16, 2010 @ 8:20 am

  75. With a thin non-conducting layer, the impedance would vary inversely with frequency, right? What sort of coating would you need to make a dent at phone frequencies? Is there one that could handle it with a thin layer? Would need a helluva low dielectric constant…

    Comment by Bob — July 16, 2010 @ 11:48 am

  76. I weed on my phone and it crapped out.

    Comment by tosher mcfarkus — July 17, 2010 @ 12:09 am

  77. Instead of checking the phone when you have 5 bars… and saying “hey, no problems”… you should check the phone when you have only 1-3 bars… and *THEN* see if they drop when the phone is held differently.

    Comment by Patty — July 17, 2010 @ 9:17 am

  78. week 23 as you can see, bar drops a bit, Spain has an impeccable network, no dropped calls either before and after 4.01.
    love my 4.

    Comment by 87023***A4S — July 18, 2010 @ 9:41 am

  79. Early iPhone 4: 0.6 ohm, no drop issues so far.

    Comment by EricS — July 18, 2010 @ 9:55 am

  80. If this is true, I wonder if the white ones will have this fix or if they were part of the bad batch?

    Comment by Bart — July 18, 2010 @ 7:34 pm

  81. [...] (it’s only been a few hours), but I was intrigued by this blog post at iFixIt about how Apple may be applying a non-conductive coating to the metal frame on the [...]

    Pingback by TechnoWatch — July 19, 2010 @ 10:33 am

  82. [...] 报道说(iFixit 接着跟进)一些用户称,新的 iPhone 4 [...]

    Pingback by iPhone 4 归来:分析 iOS 4.0.1 和天线问题 - Apple4.us — July 20, 2010 @ 12:11 am

  83. My phone:
    Production week 28
    Ohm resistens about 0.8

    Internet 3G speed With 3/4 bars on the phone. I live in a bunker-like environment. ;-)
    Normal grip: Down 4.232 Mb/s Up 1.124 Mb/s
    “Death grip”: The phone switches over to the Edge network: Down 0.203 Mb/s Up 0.046 Mb/s

    No problems or dropped calls so far.

    Comment by LKG — July 20, 2010 @ 1:38 am

  84. [...] Pasak iFixit vyrukų, naujųjų iPhone 4 telefonų apvado (kuris yra ir išorinė antena) varža lygi 0 omų. iFixit tinklaraščio komentaruose galima rasti dar daugiau informacijos kaip atskirti naujesnius, kokybiškesnius telefonus. Jeigu Birželio viduryje (25 metų savaitė) pagaminti iPhone 4 dar turi ryšio problemų. Tai telefonai pagaminti Liepos pradžioje (27 metų savaitė) jau ryšio problemų nebeturi. Norėdami sužinoti, kada pagamintas Jūsų jau turimas, ar žadamas įsigyti iPhone 4 tiesiog patikrinkite jo serijinį numerį ir sužinokite kada jis pagamintas. [...]

    Pingback by Naujesni iPhone 4 nebeturi ryšio problemų « praeivio dienoraštis — July 21, 2010 @ 2:31 am

  85. The metal frame or bezels are designed as parts of the ground plane of the internal 3G PIFA antenna according to the following patent from Apple, “Antennas for handheld electronic devices with conductive bezels”.

    http://www.wipo.int/pctdb/en/wo.jsp?WO=2009002575

    Comment by GlenW — July 21, 2010 @ 12:40 pm

  86. I have only one bar….sometimes 2

    When I just talked to the apple care service via my iphone 4, I surprisingly could notice 5bars on the screen. When I hang up, it decreased again to one bar.

    During the call I could notice bad reception noise and sometimes short dropouts, although I had 5bars during the call.

    Could it be that the reception strength still or even since the update is displayed COMPLETELY wrong?

    Comment by Chris — July 22, 2010 @ 2:26 am

  87. hey guys, got mine iphone 4 today from t-mobile germany.
    serial 82028..a4s
    I can definitely confirm the death grip. right now i am updating to new ios 4.0.1

    Comment by mz — July 22, 2010 @ 3:36 pm

  88. [...] Okay here’s what iFixit say’s about the decoding of the serial # and there replacement: [...]

    Pingback by Is Apple already Doing a Silent Recall For iPhone 4's? | Your One Tech Stop — July 26, 2010 @ 10:08 am

  89. Please, put your factory ID AND your production week.

    it seems like the 84, 85 factory aren’t changing the production line, and the iPhones 4 with 86 87 88 with production week >=27 are fixed

    Comment by Séb — July 27, 2010 @ 11:08 am

  90. how can it be that an iphone serial is: 87030xxx & 88030xxx when actually its now the 30. week 2010 and my 2 iphones 4 where shipped at july,22. (29.week).
    is the 4th/5th digit really week of production?
    any idea?

    Comment by Pit — July 28, 2010 @ 12:33 am

  91. serial: 88030xxx and 7S029
    I don’t have them here, there are still on there way. But how can i get an iPhone with the Produktionweek 30 that was shipped on the 22. July. And where is the Factory 7S located? 88 could be without the Problems so what about the 7S?

    Comment by Jonny — July 28, 2010 @ 6:15 am

  92. 87030xxxA4T – T-Mobile Germany
    Death Grip = Dropping Bars down to 1 bar

    Comment by Goosch — July 29, 2010 @ 1:44 pm

  93. [...] tin thêm về số Serial của iPhone 4 có thể tham khảo thêm tại đây: iFixit Theo [...]

    Pingback by Có nên mua iPhone 4 sau ngày 30/7? : Tin Nhanh Viet Nam — July 29, 2010 @ 6:33 pm

  94. Serial 85030xxxA4T
    Purchased in Australia.
    Measured resistance 0.6 Ohm

    Comment by Carl — July 31, 2010 @ 12:54 am

  95. Just picked up my own iPhone 4. Serial starts with 88031. At first I thought it was having the issues, until I looked at my old 3G and saw it’s signal was falling too as I walked through the mall. Waited until I got it someplace where I had full bars and was unable to make the bars go down no matter how I held it.

    Comment by Dastion — July 31, 2010 @ 4:25 pm

  96. Hello My Phone reads Serial No. 85029, Though I dont have it my hand yet , I just ordered it from Vodafone Spain & waiting to get it as i have to migrate from one network to another & as you may all know that here is spain customer service is the least important thing. They event tried to convice me that he IMEI is the same as the serial number . I had to go through a tough time to get the serial number for a produt i purchased. Any ways, just want to know if any one can tell me is the number 85029 have antenna issue . Thanks

    Comment by Faraaj — August 3, 2010 @ 1:59 am

  97. Week 29, 32 gig phone, about half an ohm. No signal problems at all.

    Comment by Owen — August 3, 2010 @ 2:28 pm

  98. Just received my iPhone 4 from Apple yesterday. Serial# starts with 88031.

    I get 0 ohms when I measure the antenna band with my multi meter, and I’m able to reproduce the antenna problem, unfortunately.

    Luke

    Comment by Luke Morris — August 7, 2010 @ 6:00 pm

  99. [...] Is Apple silently fixing the iPhone 4 antenna issue? « iFixit Blog [...]

    Pingback by Tearing down Apple iPad. — August 8, 2010 @ 1:32 am

  100. where can i get iphone screen some one shoul help me..or email me

    Comment by Ahmed — August 17, 2010 @ 3:48 am

  101. Week 32 iPhone 4
    0.3 ohms

    Comment by filmfrog — August 18, 2010 @ 9:27 pm

  102. 7T033****4S

    i can reproduce the antenna issue, but never goes less than one. and doesnt have the problem often, its pretty rare

    Comment by Montreal — August 19, 2010 @ 7:31 pm

  103. Forget about it:

    Got a T-Mobile Germany 32GB here,production-week 33, death-grip works as expected (going down to 1.5 bars)

    However, since I’m alsways using a case (actually a neat black-only-one from art-wizz), death-grip doesn’t affect the iPhone at all.

    My 2 cents:

    Install Apple’s app “case program” and order your free case, and you’re all set.

    Cheers

    Gregor

    Comment by Gregor — August 26, 2010 @ 9:54 am

  104. Hi ifixit team,

    Have just received my iPhone 4 on Monday 30 August, Serial No 85033—-4T. I measured the resistance as discussed at 1.3 Ohm. My unit does not show any antenna attenuation problems even when the carrier signal is only 1 bar.

    Regards/ George

    Comment by George — August 31, 2010 @ 10:57 am

  105. How much of a different would be required to see. The most recent comment says 1.3 Ohm and the very first one is 0.1 Ohm. Is that considered a large enough difference?

    Comment by Mark — September 1, 2010 @ 9:52 am

  106. Hi!
    I received my Iphone yesterday after I ordered it in the french apple online store.
    I was hoping that it would be a unit with a changed hardware, which it obviously is not.

    It shows a signal drop of almost -20dB (field test mode from ios 4.1)

    Resistance: 0.5 Ohm, wherby I have to say that a 4-wire measurement would be required and the result is very much dependent on the kind of probe you use.
    serial: 84036….

    I’m going to return it next week.

    Comment by Marc — September 11, 2010 @ 9:35 am

  107. [...] alguna mejora en el diseño, dudo que para la mayoría de los usuarios vaya a ser un problema. Según iFixit, los equipos nuevos ya se están fabricando con una pintura que cubre la zona conflictiva de la [...]

    Pingback by El iPhone 4 sale a la venta este viernes en la Argentina con Personal - lanacion.com | Blogs — September 20, 2010 @ 11:35 am

  108. Ok just got my replacement phone in the mail and YES the metal feels slightly different it is not as smooth as my original one and I have them side by side the one I got is 80033xxxxxxx so manufacture week is 33. Ive applied the death grip and although it drops the bars it doesn’t drop a call nor lose the signal completely. On my old one if I give it the death grip with a few seconds it goes to No Signal.

    So I can’t tell you for a 100% Apple has fixed the issue on the newer phones but A. the metal feels slightly rougher and B. the death grip will not drop my calls

    Cheers
    Ruben
    http://www.iPhoneFF.com

    PS I requested the Apple support rep to mail me a replacement phone so there was a $29 shipping cost and they will put a $599 hold on your credit card until they receive your old phone back they will waice the $29 if you have a protection plan but I spoke to the tech at 7pm last night and received the phone 9am so I didnt mind paying the $29

    Comment by Ruben — September 21, 2010 @ 10:42 am

  109. Received my iPhone today: 84035xxxxx (35th week of production).
    Antenna is really conductive… around 1Ohm.

    I did not test the attenuation problem. I just saw that touching the antenna did not alter wifi performance.

    Comment by Hugo — September 21, 2010 @ 2:58 pm

  110. I have checked my Iphone4 which I have ordered it as unlocked from CANADA
    The serial Number is: 85034xxxA4T
    it is still has the antenna when you hold it with death grip, the OHM figure is 0.6 Ω which is means that it is conductive.
    However, everyday use I do not have any issue plus I anyhow use a transparent cover to protect the phone and preserve the look (even if there wasn’t antenna problem I will still use cover)

    Comment by Adil — September 22, 2010 @ 6:11 am

  111. [...] Is Apple silently fixing the iPhone 4 antenna issue? « iFixit Blog [...]

    Pingback by RiteAV – Coax Cable Satellite/CATV/Antenna 12ft. | VideoHungry.com - Watch Movies and TV Shows Online — September 23, 2010 @ 11:47 am

  112. [...] Is Apple silently fixing the iPhone 4 antenna issue? « iFixit Blog [...]

    Pingback by RiteAV – Coax Cable Satellite/CATV/Antenna 6ft. | VideoHungry.com - Watch Movies and TV Shows Online — September 23, 2010 @ 8:37 pm

  113. I just received a Week 37 iPhone 4 today. Measured the impedance and it’s 0 ohms, so there is no new coating to prevent conductance. That said, I have tried the “death grip” over and over and I have seen absolutely no loss in signal by reference to the signal bars.

    Comment by Tookay — September 24, 2010 @ 3:12 am

  114. A friend of mine got an early iPhone 4 and said he could make the bars drop. He later returned the phone due to proximity sensor issues. He recently bought the iPhone 4 again and this time no problems. He is unable to make the bars drop. I talked to a couple of people at my work place with iPhone 4s and they’ve never had any problems. One had gotten his iPhone 4 on release day.

    So I finally jumped on board and got an iPhone 4. I can’t make the bars drop. I watched a YouTube video on how to make the bars drop, and couldn’t do it.

    So I think it was more a quality control issue. A small set of iPhone 4s were just a bit defective coming off the assembly line. The overall design was fine. Apple has probably just improved it’s manufacturing by testing each iPhone for antenna or proximity sensor issues before allowing to pass QA.

    Comment by Wilson — September 25, 2010 @ 6:02 am

  115. One of my friends got an iPhone 4 on launch day in Sydney, I was able to do the death grip thing on his phone.. But another friend received her iPhone 4 2 weeks ago, upon talking about the apparent reception issue I tried to do it on her phone to show her, and to no avail! It dropped 2 bars from full signal and didn’t cut out at all. Even when doing it on a phone call to test it, no drop out from it :)

    Comment by Tom — September 26, 2010 @ 11:30 pm

  116. [...] 27  hanno molte probabilità di avere il problema risolto; inoltre sul suo sito-web alla pagina http://www.ifixit.com/blog/blog/2010/07/13/is-apple-silently-fixing-the-iphone-4-antenna-issue/ vengono effettuati dei test aggiuntivi come la misurazione della resistenza, essa appare di 0.6 [...]

    Pingback by iPhone 4 senza antennagate ? un video SEMBRA dimostrarlo… @ TuxWinMac — September 29, 2010 @ 8:39 am

  117. [...] aggiunta a queste info, sul sito di ifixit.com (clicca qua per raggiungere la pagina dedicata) vennero pubblicati in luglio i risultati di test effettuati (su [...]

    Pingback by iPhone 4: non piu’ problemi di ricezione? | iPhone 4 - iPhone 4G — October 1, 2010 @ 3:19 am

  118. I had a week 36 phone with full on drop-to-zero reception issues, as verified by my speedtest being unable to ping, download and upload. I had it replaced due to a misaligned back panel (flash and LED didn’t line up) and this one is a week 37 and i can only make it drop one bar, maybe two bars at most with the deathgrip! I can’t cause my calls to drop anymore, where my last one could drop it within 15 seconds of deathgripping. Speedtesting it though, shows that ping is slightly hindered by deathgrip, download speed is unaffected but the grip kills upload speed. How strange.

    Comment by Matt — October 14, 2010 @ 3:18 am

  119. I got mine replaced and the new one was manufactured on the 31st week according to the serial number. The resistence is also close to zero when mesured with a multimeter so I guess no improvement….

    Keep in mind that this is not accurate as a multimeter will mesure the resistance at frequency 0 and the actuall signals being involved in the transmitting/receiving are of a much higher frequency… So the result given by a multimeter is basically useless.
    The only way to really test it would be to hook up the antenna to a network or impedance analyzer.. I do have the necessary equipment at the university where i study but I am not just going to hook up my iphone to machines that will basically inject test signals of unknown amplitude….

    Comment by McFLy — October 14, 2010 @ 3:20 pm

  120. [...] aggiunta a queste info, sul sito di ifixit.com (clicca qua per raggiungere la pagina dedicata) vennero pubblicati in luglio i risultati di test effettuati (su [...]

    Pingback by iPhone 4: non piu’ problemi di ricezione? | iPhone Portal — November 2, 2010 @ 8:03 am

  121. A friend of mine got a week 43 (end of october) iPhone 4 and it still exhibit the reception issue.

    So still no hardware fix whatsoever and I’m guessing that there will never be any hardware fix on this antenna issue for the iPhone 4, the hardware fix will come with the iPhone 5, nothing before that.

    Comment by bpresles — November 8, 2010 @ 5:53 am

  122. hi i bought my iphone today from the stores in UK and i can confirm it was manufactured on week 48, i have not yet tested it out for the bar dropping which i will do later on and give my result on here, i did have an iphone previously were i had returned it back for the drop calls, wait for my response people.

    Comment by habz — December 7, 2010 @ 11:36 am

  123. i have now tested my iphone 4 which was manufactured on week 48 and can confirm that apple has not changed the hardware at all because i can get the bars drop to 1 bar and this one seems more worse than my previous one.

    Comment by habz — December 8, 2010 @ 1:20 pm

  124. Would you mind telling the version of the firmware and baseband of your week 48 iphone 4? I had one, and I want to do jailbreak. Thx!!

    Comment by Mariel — December 11, 2010 @ 1:19 am

  125. While we are in the area of Is Apple silently fixing the iPhone 4 antenna issue? iFixit Blog, IPhone has revolutionized the mobile video market. It offers better, stronger and crisper screen. They provide better returns on your investment and also enhance business productivity – all the more reason to purchase iPhone 4.

    Comment by iphone 4 — December 15, 2010 @ 8:15 pm

  126. I have 84023xxxx4s

    I have no signal drop at all. Even i tried for 10 min.

    Comment by jony — December 16, 2010 @ 3:10 pm

  127. in order to get signal drops you must have your iphone 4 on 3g mode, it cannot be on 2g mode or else it wont work.

    Comment by habz — December 17, 2010 @ 2:28 pm

  128. I have an iPhone 4 in the UK, I got last week and it was made on the 50th week.

    I can confirm it does not loose any bars when holding the phone in the bottom left corner.

    79050xxxA4S – iPhone 4 16GB :)

    Comment by Josh Shepherd — January 4, 2011 @ 10:40 am

  129. Also to add the antenna has a different feel to it, it has a matte texture.

    Comment by Josh Shepherd — January 4, 2011 @ 10:41 am

  130. did you have your network on 3g mode because thats the weak signal try it that way, my one was manufactured on the 48 week and i was able to recall the bar drop altough could not completely loose the signal which meant there were some changes made.

    Comment by habz — January 5, 2011 @ 2:29 pm

  131. [...] calls.Verizon’s iPhone has a tweaked antenna design.Different network, different antenna. Apple allegedly fixed its Antennagate woes by quietly adding a nonconductive coating to later iPhone 4 models on [...]

    Pingback by Verizon’s iPhone 4 vs. AT&T’s iPhone 4: Twins compared — January 11, 2011 @ 11:57 am

  132. Hi, from Spain

    Week 48. The problem is the same, but with another iPhones with diferent weeks >35 no problems in antena but problems in the proximity sensors…

    Bad Job in the plants of production of China. The demand is proporcional this errors… Proximity sensor fails, antena problems, diferent tones of color of the screens, camera flash led problems, …

    Bad Job Steve, this errors are evidents. The iPhone 4 is bad option… In my opinion, tris problems aré intencioned, little. Bugs an problems in a few part of production=very discursions in forums, very free publicity, very applefans waiting the iPhone white or the iPhone 5

    Is evident

    Comment by Alex — January 14, 2011 @ 8:45 pm

  133. There are going to be certain features that you examine a must as study all of your choices.

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