Anti-theft alarm makes your phone useless to the thief even after he restarts the phone, changes the SIM and battery.
Are you concerned that someone will access your phone and see all your private information?
Are you worried that someone is checking your phone regularly?
Do your friends misuse your phone (texts, Facebook and emails etc.) without your permission?
Do you hate inquisitive people trying to access your phone all the time?
Use theft alarm if you don’t want anyone to use your phone without your permission.