my phone is to hot and i do restarting my phone but steal hot

I wouldn't worry about it. If the iPhone got too hot, it would shut itself off and show a disabled message.

Take a look at this Apple doc -> Phone, iPad, and iPod touch (4th generation): Keeping device within acceptable operating temperatures

that is a safety issue please try to restore the phone if it is still that hot then call apple and if your with in the warrant get a replacement. your right that isnt normal