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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.
Currently in the US cellular phones use either analog service or digital service. Most new cellular phones use digital technology. Currently three digital wireless technologies are used in the USA: TDMA (Time Division Multiple Access), CDMA (Code Division Multiple Access), and GSM (Global System for Mobile Communications). Unfortunately, many times digital cellular phones may work with only one technology: TDMA, CDMA, or GSM. | ||
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