CHANGE OF MOBILE COMMUNICATION SYSTEM USING RESELECTION OF PREFERRED SYSTEM

摘要

A mobile terminal is control to change from being attached to a first mobile communication system to being attached to a second mobile communication system, through an update of a list of preferred mobile communication systems for the mobile terminal, according to which update the second mobile communication system has a higher rank than the first mobile communication system. The mobile terminal receives the update via the first mobile communication system and changes from being attached to the first mobile communication system to being attached to the second mobile communication system based on the updated list.