Office of the NBTC. Recognizes the importance of creating a tool that people can check with your mobile phone, and protect themselves from the use of mobile phones. Has made the application layer 3 "Make informed lock" can "check" that is registered to use the mobile phone as many call "informing" the unknown, and the number of missing "locked" to prevent others. bring your card to someone opening a new SIM. And can be "unlocked" from the application layer 3 with yourself.