By relabeling its existing 3G network, the country's second-largest wireless carrier joined the noisy fray over so-called fourth-generation wireless technology, which promises mobile Internet speeds so fast that huge files can be downloaded in minutes and streaming video can be watched without the interruptions of earlier-generation technologies.

WSJ: AT&T Relabels Wireless Network, Speeds Up Next Generation Rollout

"If you look at the first wave of the Internet as being about content, and the second generation being the interaction of people-to-people connections ... just now we're getting to the point where there's scale, " Sze says.

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