Quote:
Originally Posted by island911
"You're holding it wrong" - Steve Jobs
Seriously, motion is spot-on one aspect - as tower signal strength weakens, the phone will bump-up the output to maintain connections. (all phones, on all carriers, do this)
Also, you can't always judge true signal strength from the bars displayed.
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I have very weak reception with Verizon on my iPhone 4S at one of my homes, and it does not affect battery life. I think it has something to do with the CDMA vs GSM radio used by different models. In the same house, my other iPhone 4S with AT&T would last a few hours and be completely dead.