iPhoneAid removes the mylar(silvery)piece that covers the holes in front of the sensor on the front white glass replacement. On a black to white conversion, it appears to work very well in most cases. I should mention that we are using 4.0.2 OS with the conversion.

It is because the IR signal from the proximity sensor is reflecting back from the white dots on the inside of the screen, so it is being prevented from passing through the glass, the way I solved it was to remove the mylar sticker and colour over the white dots lightly with a black marker pen, you can't see the black marker from the front but when you hold the screen up to the light and look through from the proximity sensor side you should be able to see through it and it has sort of a red look to it. This seems to allow the IR signals to pass both ways through the glass. If you look through the black glass display you will see the same sort of colour when held up to the light. Hope this helps, it solved the problem for me. Just be aware that if it doesn't work the marker pen is virtually impossible to remove without damaging the screen.

i can confirm that using a black permanent marker and covering the little holes DOES fix the issue for the proximity sensor with the white conversion

I've had the same problem and solve it by doing the following!

The solution is next!

-Put a little black around the sensor, just do not cover either of the two sensors

-or just install from Cydia CallLock

i've converted mine back and forth 3 times already with diferent white fronts.

never had a problem so far.

you guys must be getting from dodgey places? XD

a huge setback on this issue for me. I did a white conversion on a brand new iPhone 4 (with 4.2.1 software and even the new 5 point (star)m security screws on the bottom. The prox did not work on 4 different white front assys. I then put one of the white parts that did not work on my personal white iphone and the part did work. so, the part was good after all. Then I swapped out the logic board out. I took mine out and put in the new iphone 4'S logic board, and the prox stopped working. So in the end its either something with the new logic board or the 4.2.1 software. Apple did say they were going to fix the prox issue with software updates. I restored the iPhone 4 back to black and the proximuty work fine. I noticed that when its dark you can actually see the "infared light" come on in the sensor area when making calls. I did not see this infared on my personal phone. Maybe Apple dialed up the intensity on this infared light and that is what causes the prox not to work on the white assy.

Same problem here, black 2 white conversion on brand new iphone4 with pentagona torx screw and Fw 4.2.1 onboard, tried all as suggested here, removing Milar covering prox glass holes, painting the holes area with a black marker,no success!

Just hoping on a Fw issues...

It dawned on me that some of the proximity sensor parts are not installed. Was the glass broken before the conversion took place?

If you look REALLY closely at the proximity sensor, you should see a VERY small black square around it. It pops off and you'll see it is actually attached to a very small piece of colored glass. If this is missing, the proximity sensor will not function correctly. Most likely because it will pickup reflect light from the LCD.

Hope this helps.

@ Paul,

how old was your iphone? do you have a picture of your solution?

@nasoftz, were do you got the not OEM sensors?

I see a lot of you are having this issue... I am having several issues after converting to a white iPhone 4. Fist of all, my proximity sensor is not working at all. I have yet to test this ideas, but will be doing that tonight or tomorrow. Depends on when I get my pentalobe screw driver. The other issue I am having is, my wifi reception SUCKS. I can get wifi connected, but it has a very small range. I have tried replacing the wifi antenna on the dock/home button assembly thing. Then I cleaned all of the contacts, and I have tried re-arranging screws. I do know the EMI cover on the top of the phone has a long screw on the top middle. That really affects WIFi, but that is put in correctly and the silver conductive ring is still on there. Anyone have any ideas on how to fix this? I appreciate your time!

hey guys!

I cut a piece of black electrical tape, I drilled the tape with a heated needle, I made ​​two holes at 2 mm from each other, I applied the tape on the sensor, I applied the white touch, and the proximity sensor works perfectly.

my iphone is the one with the Torx screws.

I even I also colored with a black marker the back of the holes located on the touch.

I could not ask for more.

where you purchased the white parts?

many thanks.

Black marker trick with old release i4 didn't worked for me :( anyone know any other solutions for this issue?

What I recommend is to remove that film and then put about 5-10 dots of black sharpie on the back of the glass where the proximity sensors go. Then wipe it off with a Q-tip or napkin and that should work. Make sure to leave some of the sharpie on. It should not show through the glass. I have this done on my white iPhone 4. Works perfect. :) Hope that helps!!

I replaced the prox ribbon in my phone because the lock button stopped working and now the prox does not work. I tried 2 different new ribbons and haven't had any luck. The crazy thing is the sensors work if I plug

them in the phone "free air" but do not work when installed in the OEM location. I am talkie about a phone that has an OEM front. It's almost as if it does an initialization on restore, or the sensor is not centered correctly in the holes ( which is almost impossible). I tried

I moved it around and tried three different sensors with no luck.