AT&T has the fastest speeds for text, data and voice service in Columbus, Ohio, a RootMetrics report says. AT&T benefited from a multimillion-dollar network upgrade that included deployment of 4G LTE, the report says. "AT&T's addition of LTE led to a dramatic change in their speeds. There's a world of difference between LTE speeds and the slower speeds AT&T had last time," RootMetrics CEO Bill Moore says.

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