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There are many large cellular phone companies that operate in the USA. Each cellular phone company provides various cellular phone services and offers a number of cellular phone plans. Many of these companies limit their presence to a select number of states. Services that each cellular phone company offers to the residents of the states where that company operates range from local cellular phone plans to national long distance plans. Prices and promotions vary from company to company. Most important US cellular phone companies include, but are not limited to AT&T Wireless, Sprint PCS, T-Mobile, Cingular Wireless, Verizon Wireless, Nextel, and others.

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Most phones especially GSM (the one's w/simcards in the back) are able to work on more than one network of the same type for example GSM Providers like Tmobile, Cingular, Att&T(GSM), Orange, and more can ALL use the same unlocked phones.