Today's video-streaming, videoconferencing smartphones have an almost insatiable appetite for data. These devices don't just sip bits, they gulp them down in a movable feast of apps, video and Web browsing. But all that data has a downside: surfing the once-wide-open 3G freeways can now seem like slogging through rush-hour gridlock. At times, even basic tasks on a smartphone can bring you back to the dial-up days, when Web pages took minutes to load. Enter 4G.
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