Carriers have barely rolled out their new third-generation wireless networks, and they're already talking about the fourth generation, which could offer affordable high-speed Internet access for consumer electronics devices on the go. In laboratory tests, WiMax supports peak data speeds of about 20Mbps (megabits per second). But average speeds in the "real world" are somewhere between 1Mbps and 4Mbps, much faster than the 400Kbps (kilobits per second) to 700Kbps downloads available using current 3G.
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