What would happen if you put your cell phone in the microwave?

Very bad reception, probably zero. A microwave oven is designed as a Faraday cage to keep microwaves inside, and will be equally effective at keeping cellular radio signals out. read more

IMPORTANT EDIT: I maybe caused misunderstanding, Im so sorry. Of course, DON'T POWER THE MICROWAVE!! Only put the phone inside, and if it uses the same wavelength that WiFi (like I explained) you could see if your microwave has leaks! ***** I did this experiment. read more

Moreover, heating metal-based electronic devices to high temperatures is generally not a good thing, and the most likely result of placing a cell phone in a microwave oven will be that the phone will be ruined (and the microwave oven potentially damaged as well). read more

Microwaving a cell phone for any length of time can cause irreparable damage to the device through electrical arcing and scorching. The electrical discharge will damage or destroy the delicate circuitry inside the phone and may even cause the battery to rupture or start a small fire. read more