If your mobile or cell phone is stolen, you can disable it by following these instructions:
1. First of all, obtain your phone's serial number by keying in: *#06#
2. Write down the code that appears on screen and keep it somewhere safe
3. If your phone is stolen, contact your service provider and give them this code. They will then block your handset so that, even if the SIM card is changed, your phone will be useless.
You may not ever get your phone back but at least you'll know that no-one else will benefit from using it.