Don’t hold your phone to your head. Use the speaker or use a headset. If you must hold it to your head, then immediately stop if it starts to feel hot. FYI.
How Do Gadgets and Phones Explode – How to Avoid Cellphone Explosions – Popular Mechanics
The Consumer Products Safety Commission is investigating a Motorola Droid 2 that allegedly exploded at the ear of a Texas resident. Could this happen to you?