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Q: heating issue
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Apr 3, 2015 7:07 AMby Ingo2711,The phone can get warmer when it is charging, this should be no problem, as long as you use the original adapter and USB cable that came with the phone.
Using 3G also creates more heat, due to the processor power going up.
Maybe also check this article about it:
Keeping iPhone, iPad, and iPod touch within acceptable operating temperatures - Apple Support
