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What are the benefits of a cingular sim card?

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What are the benefits of a cingular sim card?

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Cingular (now AT&T) SIM cards are required to access wireless phone service with the provider. In addition to allowing voice and data service, the SIM cards provide users with a great deal of flexibility and worldwide roaming capabilities.BenefitsAT&T SIM cards are equipped with the Global Systems for Mobile (GSM) technology which is compatible throughout the world. AT&T SIM cards provide extensive coverage in United States and international roaming in more than 200 countries.TransferenceAT&T SIM cards allow users to change phones very easily. Unlike CDMA technology, which requires users to contact customer service or go into a company-owned store when they want to transfer phones, AT&T users can simply remove their SIM card and install it in the AT&T phone of their choice.Phone BookPhone book/contact information can be stored directly to the SIM card. Therefore, when users change cell phones, they do not have to import their contacts manually; the SIM will load the contacts for them.3

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