Billionaire McCaw, the former chairman of Clearwire Corp. and a pioneer of the cell phone industry, says dyslexia pushes people in one of two directions. "People are either defeated by it, or they become much more tenacious," he says. When the going wisdom was still that cell phones would never catch on, McCaw says he was able to see the problem differently and insist there was a future for the new — and now indispensable — technology.