The fourth one is pretty pointless
I work for a mobile phone company in customer service, and if your phone does get stolen, we simply have to check the system to see which IMEI number (the 15 digit code) has been used. Every time you make a call, the IMEI is logged on our systems. We then put it on the blacklist, and the thief can't use it with any SIM.

EDIT Oh, and there are dodgy ways to get a phone off the blacklist, by 'cracking' the handset or whatever, so if the thief is technologically minded, there are ways around it.
(Pavlov's Frog figures no-one really reads sigs anyway, Thu 31 Jul 2008, 13:14, Reply)