I have been charging my friends 2 iPhone 4's for him and they both get hot when charging. Using the same charger, my old iPhone 3Gs only gets slightly warm when charging. Why the difference?
Hmmmm... strange. My 2 iPhone 4's charge without any noticeable heat. Are there any other issues with the devices, or is this the only one? If all works well, then you can probably disregard.
I have been charging my friends 2 iPhone 4's for him and they both get hot when charging. Using the same charger, my old iPhone 3Gs only gets slightly warm when charging. Why the difference?
I use the same charger on my iPhone 3Gs and it barely gets warm yet my friends' 2 iPhones 4G gets extremely hot. I am not sure but I think they might be already used although they came in new packaging and have no nicks or abrasions anywhere. Maybe the batteries are different.
I'd say it might be the charger, only because my iPhone doesn't get warm when I charge it. The only time it gets noticeably warm is when I'm doing a Google+ Hangout.