do something beforehand just in case the worst case scenario becomes reality.
There is a lot of anti-theft software for mobiles available. Track the movements of your mobile, using the gsm cell-id localization with this free software: http://www.symbian-toys.com/ or gain informations about the thief, monitoring his activities like sent and received sms, incoming and outgoing calls, phonebooks contacts added.
"Theft" is also a great software solution: http://www.symbianbrains.co.uk/
If stolen a siren goes off. If you call your mobile you will be notified of the new number if the thief changes your SIM. It does a lot more- some things are truly stunning ->€14.99