Why my iphone 5s becomes too hot when i on my mobile data my ios version 9.2.1

[iMore Question]

Help me out of this problem

 

[AustinIllini]

Honestly, if you are fortunate enough to live close to the Apple Store, I would go there. We all can speculate here, but unlike desktop OS's, there's really not a great way to diagnose problems in iOS the same way.

My phone gets warm sometimes during software updates, but that's about it.