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It depends on what type of phone it is, GSM, or CDMA. You can tell the difference between the two, fairly easily: GSM phones take a SIM card, while CDMA do not : If it's a GSM phone, AT&T would be a provider, as would T-Mobile. If it's CDMA, Verizon would be your best bet!

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Q: I have an unlockedsmart/pda cell phone, now can any of these companies activate for it on their set up plans, either prepaid or postpaid?
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