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Answered 2008-12-03 04:02:27

Yes: As long as you have another Cingular cellular phone, that uses the GSM technology, there is no problem* (the Apple iPhone is an exception to the rule).

Your SIM card is your "phone", the single object that provides celluar service service to you. The physical phone is simply a device. Without the SIM card, it's useless.

Cingular, now the New AT&T, uses the most common network in the world, called GSM (Global System for Mobile Communications), which is used in approximately 70% of the world. Therefore, essentially, you can put a Cingular SIM card into any GSM phone.*

* There are some stipulations that can alter this answer.

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