Q: iPhone 4 heat problem

Hi Nantu76,

I'm sorry to hear you are having these issues with your iPhone. I'm a bit unclear on the exact nature and scope of your first question, but a certain amount of warming is normal during charging or use of an iPhone, as noted in this article:

When using the device or charging the battery, it is normal for it to get warm. The exterior of the device functions as a cooling surface that transfers heat from inside the device to the cooler air outside.

Keeping iPhone, iPad, and iPod touch within acceptable operating temperatures - Apple Support

If your iPhone is shutting down or restarting unexpectedly during use, you may find the troubleshooting steps outlined in the following articles helpful:

If your iOS device restarts or displays the Apple logo unexpectedly - Apple Support

If your iPhone, iPad, or iPod touch doesn't respond or won't turn on - Apple Support

If you are concerned that your iPhone is abnormally warm, or you are unable to resolve the turning off issue, you may need to have your iPhone evaluated or serviced. If so, you may find this page useful:

Apple - Support - Service Answer Center

Regards