Method and system for providing mobile transfer service

A method and a system for providing a mobile switching service are provided to enable a mobile terminal subscriber to switch an existing mobile terminal into the other mobile terminal and receive a mobile communication service, thereby enabling the mobile terminal subscriber to receive a service, which is not provided from the existing mobile terminal, from the switched mobile terminal. An MS1(Mobile Station1) of a switched target mobile terminal transmits a ProcessUSSD(Unstructured Supplementary Service Data)-Request message, a terminal switching request message, to an HLR(Home Location Register) through an MSC1(Mobile Switching Center1)(S301,S303). The HLR transmits the ProcessUSSD-Request message to a terminal switching server(S305). The terminal switching server transmits an ATM(AnyTime Modification) message, a terminal switching command message, to an FNPS(Flexible Number Portability Server)(S307). The FNPS changes a telephone number of an MS2, an existing mobile terminal, of the ATM message into a searched IMSI(International Mobile Station Identity) and transmits the ATM message to the HLR(S309). The HLR transmits an ISD(Insert Subscriber Data) message, a subscriber information switching command message, to the MSC1(S311). The MSC1 transmits a response message to the HLR(S313). The HLR transmits an ISD message, a subscriber information inactivation command message, to an MSC2(S315). The MSC2 transmits a response message to the HLR(S317). The HLR transmits an ATM response message to the terminal switching server(S319,S321). The terminal switching server transmits a result notification message to the HLR(S323). The HLR transmits a processing result to the MS1(S325). The HLR sets the terminal switching(S327).