Like most cell phones, the Apple iPhone works with a particular cell phone carrier, and in this case you have your service through AT&T/Cingular. Many business professionals want the security in knowing that their cell phone service will not be disrupted simply because they travel from country to country. Since the iPhone is serviced by AT&T/Cingular, you will not have to worry about loosing service, or features, because the iPhone uses the GSM system.
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