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Cellular phone service companies offer a range of services for cellular phone users such as postpaid and prepaid services, roaming and Internet facility. They come up with many packages to survive the intense competition in the market. Cellular phone service offers vary from region to region. Hence users need to know about a particular company's coverage, facilities and service prices before signing a contract. Customers need to identify the cellular phone service provider in their region.

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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.