White Conversion Proximity Sensor on 4.2.1. not working - Help

Here is the best iPhone 4 proximity fix sticker I have found. This will fix it. Here is where you can get it. Read the reviews. I have used it on 50 phones so far with just 2 that it didn't fix, and those 2 were already janky in the first place so......

http://www.ebay.com/itm/250888416604

Hi

I'am iPhone Repair Technician 1 year experience, repair daylig between 2-6 iPhone's.

Here a solution that works, you can use electrical BLACK tape, it must be black color, cut 2 pieces and put them together, then cut 2 very small holes, place it above the proximity sensor.

You can watch this video tutorial about the electrical BLACK tape:

http://www.youtube.com/watch?v=EX9oMrHb1...

To see where the proximity sensor, watch this video:

http://www.youtube.com/watch?v=pTVPrxkNW...

Second link that Alawi sent is the fix I use all the time and it works 90% of the time.

if this dont work try putting a tiny strip of foam btw the proximity sensors.