Probably because you're close to whatever tower it's connecting to and the radio bits are not having to spend a bunch of energy screaming at the top of their lu

Probably because you're close to whatever tower it's connecting to and the radio bits are not having to spend a bunch of energy screaming at the top of their lungs to be heard by the tower. Even plastic clad android phones will get hot if you try and make a long phone call from BFE.