HOW TO DISABLE A STOLEN PHONE
Dial "#06# to check your phone serial number, write the serial number and keep it safe, when your phone get stolen, call your service provider and give them the code, then they will be able to block your handset, so even if the thief change your sim card, your phone will be totally useless, though you won't get your phone back, but at least you know that whoever that stole it cannot use or sell it.