Your Mobile Phone Secret Number

Your mobile phone device has a 15-digit hidden serial number which is its electronic id. In case your mobile phone gets stolen, your provider can use this number to lock the device, making it thus useless to the thieves. Of course you might not find your phone again, but this might prevent thieves from stealing mobile phones in the future.
To find out this number, just type *#06# (works in all mobile phones). Write down this number and hopefully you will never nead it :)