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Non of the US carriers have real 4G, Real 4G is LTE-Advanced(GSM) and WiMax-Advanced(CDMA) both are supposed to offer 100Mbps- 1Gbps.
What we have in the U.S. is 3G HSPA+ and 3.5G LTE, Wimax
1 year, 9 months ago on What is 4G, Exactly? [Video]