I two days ago got a second hand iPhone 4s. I notice that when I start using it, it becomes hot on top right side (if you look from front) and on left top side (if you look from back) near back camera and side steel too.
It becomes hot and battery also drops quickly like 9-10% in 12-14 mints.
I resetted the network settings too but it didn't solved the problem... :(
Please tell what should I do. I have no SIM card in it!! I'm using without SIM. I just turn on the Wi-Fi for some seconds then this happens.