Q: Any solution for iphon4??its to heat while browsing Internet

Hello there, Alpeshbhai.

The following Knowledge Base article gives us some great information about the operating temperatures of your iPhone 4:

iPhone, iPad, and iPod touch (4th generation): Keeping device within acceptable operating temperatures

http://support.apple.com/kb/HT2101

Specifically, it's good to keep this in mind:

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.

Thanks for reaching out to Apple Support Communities for answers to your question.

Cheers,

Pedro D.