4.1 update completely screwed my proximity sensor

Question

I have an iPhone 4 and never suffered any issue with the proximity sensor.
After the 4.1 update the behavior is totally random. I make several calls and I saw
the screen turn on and off permanently with the phone a half an inch of my head.
I also noted that the apparently solution implemented by Apple to solve this issue
is add some delay in the operation of the sensor. I see that the response is slow.
Any one with this problem too?
Thanks!

Answer 1

Test 3 is the main test, simply because it is fairly consistent and is one of the quickest ways to get the worst results. The other tests are essentially variations, such as the one where it shows the problem even if you don't move it fast after the screen comes on.
You're the first one to provide feedback with something besides 4.1 so I really appreciate it.
Okay, so it turns off between 1.25 and 1.5. Almost every test I've done or I've seen reported with 4.1 has it turn off at 2 inches. I have had as high as 2.5 once and been a bit below 2 a couple times. If I ever got down to 1.5, it was only once.
This fits various comments made when the phone first came out - that the screen lights up sooner than prior phones and I think your numbers match some of those reports.
For this part of the test, if you haven't upgraded yet, I would just say run it a few more times from scratch - I don't even know if that OS does a reset if pulled far away for a few seconds, though I suspect it does. The repetition helps us recognize if one try is giving unusual results.
You said you dropped the card and that the screen reactivated at 5/8". Did you just do that once? Or, after it lit up again, did you drop it again and see if it kept getting lower? This is what I did on my video - I could keep getting it lower and lower, at least to a certain point.
Also, when you raise it and the screen comes on, you could also slowly put it back down to see where it is before turning OFF again. I suspect that if it turned on at 5/8" that it will stay on down below a half inch. That is, ultimately, the critical figure.
If you really want to take the time, you could also just try making some regular call and see if it acts up (I find I need to turn the brightness up all the way to really see it without having to make a special effort to look out of the corner of my eye).
But some people won't have the problem affect them in normal use right away (some almost never). So, unfortunately, a limited testing time on real calls only tells us anything if it is so bad for you that it hits you right away!
When you do upgrade, same tests so we can see how the numbers change. Assuming you aren't one of those who have it get worse, I would expect that your starting distances are higher and, maybe, it either takes more up and down action to get it as low or it never gets as low - or both. Knowing how low you can get it now is really important for comparison later.
Of course, once updated, you have the experience in the real world on every call you make thereafter for that part.
Now, I really hope you don't start with a working phone (from the numbers you gave so far, I would say it isn't) and then, after 4.1, have it stop working right.
But if that happens, the data you can then give from this test will be the most important we could have at this point.
Thanks.