Lock control method for on-board terminal equipment of a mobile

Details Lock control method for on-board terminal equipment of a mobile Lock control method for on-board terminal equipment of a mobile

1990-07-26

1991-09-03

Tarcza, Thomas H.

Telecommunications

Use or access blocking

380 3, 380 23, H04K 100

Patent

active

050461257

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.

REFERENCES:
patent: 4626623 (1986-12-01), LaHaye
patent: 4847803 (1989-07-01), Miyano

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