Sprint continued its 4G announcement marathon this morning with the official launch of WiMax service in Minneapolis-St.Paul, MN, also known as Twin Cities, and Pittsburgh, PA. Welcome to the fast lane!

This announcement follows the Nashville 4G launch 2 weeks ago, Orlando launch last week, and the introduction of Epic 4G in the beginning of the month. Sprint’s 4G service now covers 55 markets.

Users of the only 2 aforementioned devices capable of running on Sprint’s 4G network are charged an extra $10 "premium data" fee, no matter whether 4G is available in their area or not.

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