What to do if your cell phone is lost or stolen?

"Claim:   Pressing a sequence of keys on your cell phone will produce a serial number that can be used to disable it in case of theft.

Status:   True

...To check your mobile phone's serial number, key in the following on your phone:
star-hash-zero-six-hash
( * # 0 6 # )"
- Snopes

[via Digg]