An Unlocked Cell Phone is a GSM phone that can be used with different GSM compatible carriers worldwide. To get the phone working, all that is needed to do is put the carrier's SIM card into the phone. Unlocked phones can be used within the United States using T-Mobile, Cingular, AT&T etc. and with many other GSM service providers in the world provided the frequencies on the phone match those of the carrier. On each phone's product page there is a compatibility check for carriers to help you decide better.
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