stolen mobile phones

Each of our Mobile Phone handsets has a unique serial number.
Check this number by keying in the following digits on your phone: *#06#
A 15 digits code will appear on the screen.
This number is unique to your handset.
Write it down and keep it somewhere safe.
If your phone get stolen, you can phone your service provider and give them this code.
Then they will be able to block your mobile phone, and render it useless, even if the SIM card is changed. You probably won't get your phone back, but at least you know that who ever stole it will be unable to use it but perhaps as a paper weight.
If everybody did this, there would be no point in stealing a mobile phone.