Patent ID: 8175033

Claim:
A method for changing a GPRS (General Packet Radio Service) attach mode in a mobile terminal using a GSM (Global System for Mobile) scheme and a GPRS scheme, the method comprising the steps of: determining whether a GPRS attach procedure fails due to a network problem in an auto attach mode; and changing the auto attach mode into a manual attach mode when the GPRS attach procedure fails due to the network problem, wherein the step of determining whether the GPRS attach fails due to the network problem comprises: attempting the GPRS attach procedure in a SGSN (Serving GPRS Support Node) that administers the GPRS; determining whether a reply message for the attempting of the GPRS attach procedure is received from the SGSN within a predetermined time; concluding that the GPRS attach procedure fails due to the network problem when the reply message is not received within the predetermined time; determining whether the reply message is a GPRS attach failure message when the reply message is received within the predetermined time; determining whether the GPRS attach procedure fails due to an unknown reason when the reply message is the GPRS attach failure message; concluding that the GPRS attach procedure fails due to a network problem when the GPRS attach procedure fails due to the unknown reason; and reattempting the GPRS attach procedure when the GPRS attach procedure does not fail due to the unknown reason.