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AT&T is one of the two largest wireless carriers in the United States, providing cell phone service to over 95 million subscribers across all 50 states. AT&T uses GSM technology --- most of the company's phones will work seamlessly on wireless networks in dozens of countries around the world. Most AT&T rate plans feature free mobile-to-mobile service, saving customers' minutes when calling other AT&T subscribers. The company's unique Rollover feature lets subscribers bank their unused minutes for use in a subsequent month. AT&T GoPhone service offers no-contract service at reasonable rates, while the Laptop Connect service provides subscribers near-broadband (in most areas) speed wireless data services.