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Thread: What are mobile phone "sims" used for?
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Old Feb 22, 2004 | 1:57 pm
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moondog
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Regarding your other question, AT&T has 2 services; TDMA and GSM. If you have a 1900 or triband GSM phone, you can use it on AT&T's network, provided you have either an AT&T sim or a sim from another carrier that permits roaming.
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