I dont know if this will work on every cell phone or not, but it works on both of mine...
anyway, here is something worth knowing if you have a mobile phone ....Have you ever wondered why phone companies don't seem interested in trying to prevent the theft of mobile phones? If you have ever lost, or had one stolen, and if you are on a plan, you still have to pay the plan approximately up to 24 months, and you have to buy another handset and enter into another contract. This is more revenue for the phone company.There is a simple way of making lost or stolen mobiles useless to thieves and the phone companies know about it, but keep it quiet.
To check your mobile phone's serial number, key in the following on your phone:
star-hash-zero-six-hash ( * # 0 6 # )
and a fifteen digit code will appear on the screen. This is unique to your handset. Write it down and keep it safe. Should your mobile phone get stolen, you can phone your service provider and give them this code. They will then be able to block your handset, so even if the thief changes the sim card, your phone will be totally useless. You probably won't get your phone back, but at least you know that whoever stole it can't use / sell it either. If everybody did this, there would be no point in stealing mobile phones.