Patent ID: 8792884

Claim:
A method of searching for a Home Public Land Mobile Network (Home PLMN) of a mobile terminal, the method comprising: determining whether an input by a user is generated on a specified item displayed in a predetermined area of an idle screen of the mobile terminal, the specified item being related to PLMNs; comparing a PLMN in which the mobile terminal is operating with a Home PLMN of the mobile terminal when the input is generated as a result of the determination, and searching for the Home PLMN when the PLMN in which the mobile terminal is operating is not identical to the Home PLMN; and registering the searched Home PLMN so as to correspond with the specified item, and initializing a timer set for a subsequent Home PLMN search; and when the Home PLMN is not found, identifying a PLMN based on a priority list stored in a Subscriber Identity Card (SIM) or Universal SIM (USIM) in the user's mobile terminal, and modifying the user interface based on the identified PLMN, wherein the Home PLMN represents a network having contracted a roaming service agreement with the communication provider's network to which the mobile terminal has joined.