Abstract: An embodiment of the present disclosure discloses a method and a system for locking a mobile terminal, wherein the method is applied to a mobile terminal, comprising: sending a lock state query request to a server each time when the mobile terminal is started, the server storing lock state information of the mobile terminal; comparing the lock state information fed back by the server with the current lock state information of the mobile terminal; and performing a lock operation on the mobile terminal if the lock state information fed back by the server represents a lock state and the current lock state information of the mobile terminal represents a unlocked state. The embodiment of the present disclosure avoids unlocking a mobile terminal through programming ROM, improving security of the mobile terminal.

Abstract: An embodiment of the present disclosure discloses a mobile-terminal-based time zone determination method and a mobile terminal, wherein the method comprises: determining if first zone information of a mobile terminal is acquired, wherein the first time zone information is time zone information, which is acquired through a user ID card of the mobile terminal; acquiring longitude and latitude information of the mobile terminal if the first time zone information is not acquired; determining second time zone information corresponding to the longitude and latitude information; and defining the second time zone information as the current time zone information of the mobile terminal when the second time zone information is inconsistent with the time zone information currently displayed by the mobile terminal. The present disclosure greatly enhances convenience and accuracy of time confirmation of a user in the case that the SIM card does not exist or is unavailable.

Abstract: The present disclosure provides a method and electronic device for unlocking a mobile terminal in a loss lock state. The method includes: creating a wifi open button on a home page of the mobile terminal in the loss lock state; receiving a triggering instruction of a user for the wifi open button and opening a wifi setting page; establishing a network connection according to setting Information inputted by the user on the wifi setting page; receiving an unlocking password inputted by the user and uploading the unlocking password to a server for verification through wifi; and unlocking the mobile terminal in the loss lock state, if the verification is successful.

Abstract: The present invention discloses a method, electronic device and system for back transmission of data after a mobile terminal is lost, wherein the method comprises: acquiring trigger information for characterizing that the mobile terminal is in a lost state; turning on a microphone of the mobile terminal according to the trigger information to acquire audio data of the surrounding environment; judging whether the volume of the audio data exceeds a preset audio threshold or not; recording the audio data in a first preset time length if it is determined that the volume of the audio data exceeds the preset audio threshold; judging whether a first network connection exists or not; and performing back transmission of the audio data through the first network connection if the first network connection exists.