Emergency calling with a GSM radiotelephone
US7239883B2 · kind B2 · utility
3Cited by
3References
25Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 24, 2004 |
| Grant date | Jul 3, 2007 |
| Priority date | — |
| Expiry date | Feb 2, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W76/50
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An apparatus and method for allowing emergency calling with a Global System for Mobile (GSM) radiotelephone during temperature extremes includes a Subscriber Identification Module (SIM) card, a temperature sensor; and a controller that detects when the radiotelephone has a SIM card error, whereupon the controller obtains a temperature measurement from the temperature sensor. If it is found that the temperature measurement is outside of an operating temperature range of the SIM card, the controller permits the radiotelephone to make an emergency calls only.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.