4G explained: A guide to LTE, WiMax, HSPA+, and more

We've updated our guide to 4G with more information on AT&T, Sprint, T-Mobile, and Verizon. Read on to learn what 4G is and the three technologies U.S. wireless carriers are using to take mobile data speeds to the next level: WiMax, LTE, and HSPA+. Our full FAQ.
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