Technique: Create a Micro-SIM to SIM Adapter

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How to make a Micro-SIM to SIM adapter out of the old SIM card( in the iPhone 2G- iPhone 3GS), so you can use your iPhone 4 Micro-SIM in older devices.

  • Author: DavidKircos
  • Time required: 15-20 minutes
  • Difficulty: Moderate

This simple guide will show you how to make a Micro-SIM to SIM adapter out of the old SIM card in the iPhone 2G to the iPhone 3GS, so you can use your new iPhone 4 Micro-SIM in older devices. This process destroys the old SIM-Card. Luckily when you buy a new iPhone 4 they give you a new SIM and deactivate the old one, making the old one useless.

Edit Step 1 Create a Micro-SIM to SIM Adapter  ¶ 

Image #1

Edit Step 1 Create a Micro-SIM to SIM Adapter  ¶ 

  • Get everything you'll need:

    • XACTO Knife and a good cutting surface, such as a self healing mat.

    • Pencil

    • SIM-Card removal tool or bent paperclip

    • iPhone 4

    • An old GSM SIM card that you can sacrifice to make an adapter.

Edit Step 2  ¶ 

Image #1

Edit Step 2  ¶ 

  • Remove the SIM Card from each of the iPhones

    • On the iPhone 4 the SIM Card tray is on the right side of the phone.

    • On any older iPhone the SIM Card tray is on the top of the phone.

Edit Step 3  ¶ 

Image #1

Edit Step 3  ¶ 

  • Use a pencil to trace the Micro-SIM on top of the older SIM-Card.

    • Make sure the leads line up with the ones below them!

Edit Step 4  ¶ 

Image #1

Edit Step 4  ¶ 

  • Use an XACTO Knife to cut on the line you traced.

    • It can be difficult to control the knife when applying enough force to cut through the plastic, so I recommend going lightly for the first couple of times to make a groove. Once you have a properly-shaped groove, go back and apply more force to cut through the plastic. You can also drill 5 pilot holes using a fine drill bit at the vertices. This also helps to guide the knife.

    • To get a very clean cut you can try heating the tip of the exacto knife with a small lighter torch or even Cigarette Lighter. The hot Exacto blade will easily score into the sim card this way but you may need to heat it several times as it looses heat very quickly.

    • When you are nearly done, flip the SIM-Card over. You should be able to see the outline of the cutout you made on the top side. For a cleaner result, finish cutting the slot from the bottom side.

  • Remove the piece you cut out of the SIM.

Edit Step 5  ¶ 

Image #1

Edit Step 5  ¶ 

  • Insert your Micro-SIM Card into the hole you cut out of the SIM.

  • If the Micro-SIM doesn't fit, you may need to cut away more plastic with the knife to enlarge the hole.

  • If you cut the hole slightly too big, put a piece of tape over the back of the SIM-Card (the side without the gold contacts) to hold the Micro-SIM in place. Trim away any excess tape with the knife.

    • You may want to add some tape even if the hole is the correct size; this will help prevent the Micro-SIM from coming loose inside the phone and getting jammed when you try to remove it.

Edit Step 6  ¶ 

Image #1

Edit Step 6  ¶ 

  • Test it out. I put the Micro-SIM in the converter into an iPhone 2G to test it out, and everything works great!

  • Thanks for reading! Feel free to contact me if you have any problems or suggestions regarding this method!

For more information, check out the iPhone 3GS device page.

Required Tools

iFixit Tech Knife

$2.95 · 50+ In stock

SIM Card Eject Tool

$2.95 · 50+ In stock

Popular Device Products

iPhone 3G and 3GS Power Button

$4.95 · 5 In stock

iPhone 3GS Display Assembly

$39.95 · 12 In stock

iPhone 3GS Replacement Battery

$14.95 · 47 In stock

iPhone 3GS Dock Connector

$19.95 · 26 In stock

SIM Card Eject Tool

$2.95 · 50+ In stock

Comments Comments are onturn off

Just a heads up, this could vary easily ruin your SIM card. Better off buying a SIM cutter, faster & exact results.

Josh Forester, · Reply

I just did this with the miniSIM card from my iPhone 4 (ATT) to my iPhone 3GS. First time it was not sucessful, so I pulled it out and repositioned the miniSIM card and it worked perfectly! (Note: In regards to the first post, this method does DESTROY the full size SIM card, but if you are taking these steps this card is MOST LIKELY deactivated and thus garbage. In no way *should* this harm the miniSIM card.)

Mary Jane Doe, · Reply

hahahaha...this is the awesomest and most creative post in the concentrated niche ....... how cm this post is not all over the internet than sim adapters ....and thank you by all heart for telling me this simple i wont waste time searching and ordering sim adapters

Navneet Teotia, · Reply

great trick! Thanks, you saved my day!!

gautamshirsekar, · Reply

I just leave it here

No need to ruin your phone

Nick Smith, · Reply

This worked for me very well, thank you! I used a knife to cut out the micro-sim card shape on my standard sim card. Using tape to cover the rear worked as well.

rapidcitybachelor, · Reply

Life saver! I dropped my iPhone 4s in water today. I really wanted to be able to use my number still, but have no other phone that takes a micro sim. I also couldn't even use my spare iPhone (3gs) because apparently my old sim card is too old for iPhones. So I was stuck using an old phone and an old number for the day.

On my first attempt at this the sim card kind of broke when I tried to cut into it. Luckily I had another dead sim that I could use, and it worked fine the second time. Now I can have my number and at least be able to use an iPhone.

Thank you!

Abbey, · Reply

Worked really well! My iPhone 4 died yesterday and I want to be able to call / be called until I get a new one. Used this manual to convert my micro SIM to a normal SIM for use in a (very old school) sony ericsson. For the people who say that you can ruin your SIM card: that shouldn't be a problem if you use a SIM card that is no longer useable anyway.

Amaranta, · Reply

MY carrier were giving out the regular sim cards where the micro sim could be removed from it as a pull out!

I saved the cutout & it works perfectly as a SIM adaptor! I might well go back & collect a couple more just in case!

In addition, I taped a piece of scotch tape on the non-connector side so that the micro SIM will sit still in the adaptor & still no problems fitting it back into my iphone 3GS.

Alex, · Reply

the un-used regular sized sim card i used had the outline of a micro-sim to it; so i merely cut carefully along the outline, pop out the old sim, then replace the hole with the new sim. paste a sticky tape to the non connector side to keep things in place. trim (carefully) the sides to remove excess sticky tapes.

this trimming is important because its usually a tight fit on the regular size sim slot.

all good.

wahchai305, · Reply

This worked surprisingly well. I just replaced my malfunctioning HTC One M7 with and old school Iphone 3GS. It is working really well after modifying the SIM card to cradle the microSIM. I found a sharp pair of scissors worked better than an exacto knife.

robwood777, · Reply

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