Lock control method for on-board terminal equipment of a mobile telecommunications system
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United States of America Patent
Stats
-
Sep 3, 1991
Grant Date -
N/A
app pub date -
Jul 26, 1990
filing date -
Jul 28, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A lock control method for on-board terminal equipment of a mobile telecommunications network surely inhibits persons other than the user or an authorized person person from unlocking the equipment with the intention of originating a call thereon. When a unauthorized person enters a lock code resembling a set first lock code, or unlock code, by chance after a great number of lock codes, the first lock code is replaced with a second lock code. Hence, the unauthorized person cannot unlock the equipment despite that the entered code may coincide with the first lock code. While the unauthorized person may further enter other different lock codes, the second lock code serving as the unlock code will be replaced with the first lock code as the entered code approaches the second lock code.
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