Wireless terminal and wireless telecommunications system adapted to prevent the theft of wireless service
US5983093A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 6, 1997 |
| Grant date | Nov 9, 1999 |
| Priority date | — |
| Expiry date | Aug 6, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W12/06
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A wireless terminal and wireless telecommunications system are disclosed that prevent a thief of a wireless terminal from using the stolen wireless terminal to steal wireless service. A PIN is stored in the wireless terminal and the wireless terminal itself checks that a candidate PIN matches the stored PIN before the wireless terminal will initiate a call or will establish an incoming call. Thereafter, however, the user is permitted to call that telephone number or to receive a call from that telephone number without having to enter a candidate PIN again. In the wireless telecommunications system, a PIN is stored in a subscriber database for each user. The subscriber database also contains a history list of the telephone numbers that each user has previously called or received calls from. When the user first attempts to call a telephone number from which a received call has not been established, the wireless telecommunications system requires the user to enter a candidate PIN that matches the stored PIN before the call is established. Thereafter, the user is permitted to call that telephone number or receive a call from that telephone number without having to enter a candidate PIN…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.