The 5G mobile challenge: Selling a dream

At this week’s CTIA Super Mobility show, it took someone from outside the mobile business to point out what could be a nagging question: Why, exactly, do we need the faster speeds of 5G wireless?Keynote speeches at CTIA, the main annual event for U.S. mobile operators, are heavy on futuristic applications and urgent calls for more spectrum and new networks to make those dreams real. On Wednesday, CTIA President and CEO Meredith Attwell Baker said U.S. carriers would need hundreds of megahe