CDMA terminal for providing roaming service to GSM service...

Telecommunications – Radiotelephone system – Zoned or cellular telephone system

Reexamination Certificate

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Details

C455S558000, C455S426100, C455S552100, C455S550100

Reexamination Certificate

active

07043238

ABSTRACT:
Disclosed is a CDMA terminal for providing a CDMA service to a global system for mobile communications (GSM) service subscriber in a CDMA service area which comprises: a subscriber identity module (SIM) cardholder for installing or uninstalling a SIM card of a GSM service subscriber, wherein when a SIM card of the GSM service subscriber is installed in the SIM cardholder in the CDMA service area, specific data are transmitted using a CDMA message in the case of authenticating the GSM service subscriber using information on the GSM service subscriber stored in the SIM card, and when the authentication of the GSM service subscriber is normally completed, the CDMA terminal is used for the GSM service subscriber as a roaming service terminal in the CDMA service area. According to the present invention, the GSM service subscriber can use his SIM card and number in the CDMA service area.

REFERENCES:
patent: 5537474 (1996-07-01), Brown et al.
patent: 5619491 (1997-04-01), Panzer
patent: 5862481 (1999-01-01), Kulkarni et al.
patent: 5987325 (1999-11-01), Tayloe
patent: 6438117 (2002-08-01), Grilli et al.
patent: 6714799 (2004-03-01), Park et al.
patent: 0 786 915 (1997-07-01), None
patent: 1 059 822 (2000-12-01), None
patent: 2 345 825 (2000-07-01), None
patent: 10-2000-0031583 (2000-06-01), None
patent: 2002021542 (2002-03-01), None

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