PURPOSE: An international mobile telecommunication roaming system for renting a visiting country's subscribed mobile phone and a method for using the same are provided to simplify mobile phone roaming procedures, to improve sound quality, and to give convenience to users who are familiar with the domestic usage of mobile phones. CONSTITUTION: A roaming service user rents a GSM-type roaming mobile phone(40), in which a SIM card(41) subscribed in a country scheduled to visit is installed, with his mobile phone. At this moment, the information of the user's mobile phone, the information of the roaming mobile phone(40), the matching information of the user's mobile phone and the roaming mobile phone(40), abbreviated key information, etc., are registered in a call forwarding roaming database(36). If all required information are updated in the call forwarding roaming database(36), the roaming service user departs from the country with the roaming mobile phone(40), Afterwards, if a domestic user makes a call to the roaming service user, the call signal is received to a domestic infra-network communication service provider's host telephone office(34) through a domestic PSTN(32). The host telephone office(34), based on the call signal, searches the call forwarding roaming database(36) and sends associated information, among the registered information, to a switching system(48) together with the call signal.
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