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Week 31, 32gb. Bought this past Friday. I can replicate the death grip problems if I try, but so far it has not affected me in actual use. No other issues that I've noticed so far.
 
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iP4 32GB, no issues with it at the moment. 🙂
 
Week 27. No yellow screen and the reception issue, while not even a tiny factor in practical use, can be replicated if I grip the phone in the much derided hotspot.
 
Week 31
Size - 32gb
Color- Black
Yellowing - yellow screen but no spots
Proximity - No
Reception - When gripping tight enough, at tight grip and 1 bar - calls not affected at all, data slows to zero.
Pixels - No
Sleep button - No

This is my second exchange. Will att allow me to exchange for a third time? I bought mine at the apple store.
 
Week 29, 32GB. Can do the death grip if i try, but it doesn't affect my normal use.

Battery life is poor to average - cant get 2 days out of it. Seems to be a bit better after I restored and set up as a new phone. I had previously set it up using a backup of my 1st gen ipod touch.
 
bumping this thread. i'd like to hear more people chime in with build week info and whether they have signal and/or proximity issues.
 
Week 30 here on mine.

No yellow screen, no reception issues, just the damned proximity sensor is driving me nuts. 😡
 
Week 32 / Aug
Production # within that week= 13763
Factory= 7S

No problems at all. Performing perfectly. Battery usage is way above what I expected. Getting 2 full days, and I use this phone a lot.
No screen issues or proximity issues either. I have the phone in a IvySkin "Reception" case but even without a case I have no reception issues.
 
Week 34. No issues with reception and yellowing that I've noticed. However I do have some minor niggles with the proximity sensor during calls.

Amazing that it was only made last week as I'm in Australia and I bought it on the weekend, so that means it basically flew straight to me after it was made! I'm easily impressed ok? 😎
 
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