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In areas where 3G network is not available, customers will continue to receive service on the AT&T EDGE network, when coverage is available.
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Using a plain audio modem technology over a digital cell phone gives you about 9600 baud or 10kbps (1G). GPRS (2G) is fully digital, always on once connected and is about like dial up, or slightly faster. EDGE is enhanded GPRS (2.5G), updated for somewhat faster speeds. EDGE is something like an older DSL line, 128kbps-384kbps. 3G is also fully digital, but allows full broadband like speeds, 0.5-3mbps.