Samsung is introducing a new feature in their mobile phones these days (atleast in India). The feature allows you to store two mobile numbers in your phone and lock those numbers. Whenever the SIM is changed in the phone, the phone will automatically send a text message of the new mobile number to those two numbers you stored and locked. This makes the phone traceable. In addition, the phone will make a audible whistling sound whenever a call is attended to. Wish someone will make a similiar application for BB's.