Method of locking network for PHS mobile phone

The invention is a network locking, unlocking and number burning method for PHS cellphone, where the network locking is that: after the cellphone enters in a number burning mode, the cellphone software receives read-write instruction of the number burning software to the memory and then analyses the read-write instruction, and it uses the cellphone software to read and write the memory and uses the number burning software to write in right identification code and other number burning data and writes in the network locking sign; the unlocking is that: according to PSNUM or PSID, generating unlocking code or using the right identification code as unlocking code, and after inputting the unlocking instruction, the cellphone software analyses the unlocking instruction and judges its classification: if the unlocking code is valid, eliminate the network locking sign. The method can be adapted to two requirements of locking and unlocking network.