Patent ID: 8732458

Claim:
A method for locking a terminal device onto a network while accessing said network, and said method comprising: comparing, by said terminal device, a first locking-onto-network character string in an Authentication Authorization Accounting (AAA) server authentication certificate with a second locking-onto-network character string stored in said terminal device in a process of said terminal device authenticating an AAA server; if said comparing determines that said first locking-onto-network character string is the same as said second locking-onto-network character string, said a locking-onto-network configuration verification is successful; if said locking-onto-network configuration verification is successful, allowing for verification of an authentication certificate; if said locking-onto-network configuration verification is not successful, refusing access by said terminal device to the network; and said method for locking further comprising a procedure of unlocking, wherein the procedure of unlocking comprising: an Over The Air (OTA) server obtaining and comparing unlocking keys stored by an operator server and said terminal device respectively; and if the unlocking keys are the same, the OTA server notifying said terminal device to set the locking-onto-network flag bit as disabled locking-onto-network function and clear up said second locking-onto-network character string.