Telecommunications system with value added service directory and an integrated circuit module therefor
作者： Anthony Richard Timson , Aden William Dervan , Wayne David Michaels
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摘要: In a telecommunications system such as global mobile telephone network in which each subscriber unit includes Subscriber Identity Module (SIM card), SIM card has fixed memory locations (22), to data can be addressed over the air. Some of (22) not overwritten from but accessed therefrom on entry short simple codes, associated with one locations. Further (24) read air only when enters personal identification number. Locking control files (27, 28) are used read/write access (22, 24) respectively.
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