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Thread Starter 
I thought I would post this, as I see so many people on forums commenting about their signal bars seemingly changing from strong to weak for no apparent reason -- and back again. I've seen rants about AT&T being the reason, etc.

It's because the meaty part of your palm is blocking the antenna (in the lower black area). Try holding your iPhone nearer to the top and expose the lower area and voila, the strong signal returns. Or better yet, try to use landscape when you can, to stay away from the antenna. I hope this helps someone