If your cell phone ever gets stolen, there's a quck and easy way to deactivate the phone so the thief won't run up your bill. The first thing you must do now is to enter the following into your phone to gain access to the serial number. Enter *#06#, (star----pound sign-----number 0-----number 6-----pound sign---- and you should immediately see a serial number. This number is your phone's unique I.D. Once you have this information, you then call your service provider and ask them to deactivate it.