Patent ID: 8923917

Claim:
A network-locked mobile terminal, comprising a Subscriber Identity Module (SIM) card, an activation judging module, a network locking module, a network searching module, a card locking module and an anti-crack device, wherein the SIM card is configured to report first network lock information to the network locking module; the activation judging module is configured to judge whether the network-locked mobile terminal is in an activated network-locked state, and to inform the network locking module when the mobile terminal is in the activated network-locked state; the network locking module is configured to receive the first network lock information, to judge whether the first network lock information is legal when the network-locked mobile terminal is in the activated network-locked state, and to inform the card locking module when the first network lock information is illegal, and to inform the card locking module when the first network lock information is illegal; the network searching module is configured to search the network; the card locking module is configured to lock the SIM card; the anti-crack device is configured to initiatively read second network lock information, to judge whether the second network lock information is legal, to inform the network searching module when the second network lock information is legal, and to inform the card locking module when the second network lock information is illegal; and further wherein the anti-crack device comprises an initialization judging unit, a reading unit and a judging unit, wherein the initialization judging unit is configured to judge periodically whether the SIM card has completed the initialization, and to inform the reading unit when the initialization is completed; the reading unit is configured to initiatively read the second network lock information when the SIM card completes the initialization; the judgment unit is configured to judge whether the second network lock information is legal, to inform the network-locked mobile terminal to search network when the second network lock information is legal, and to inform the network-locked mobile terminal to lock the SIM card when the second network lock information is illegal.