Why does my phone get hot in my pocket?

[AC Question]

Whenever my phone is in my pocket it gets very hot and dies but there is no insulation in my pocket, can you please help me?

 

[Mr Mendelli]

That's normal. Depending on the specs of your device and how old it is, it may have a harder time running certain processes or being on for extended periods of time. As long as it isn't steaming or burning you, I wouldn't be concerned. Lithium-ion batteries are what just about all smart phones have, and tend to warm-up while in use or while charging.