Cable companies and Wi-Fi: A few years ago, that combination may have seemed improbable. But as pay-TV operators from Charter to Time Warner Cable build Wi-Fi access points across their footprints, the promise of Wi-Fi as a viable answer to wireless service is growing. "Wi-Fi is going to be their mobile play. There's no question about it," said Jeff Heynen, research director at Infonetics Research. The strength of an operator's Wi-Fi services could directly impact any potential mergers shaping up in the wake of Comcast's failed acquisition of TWC. Correspondent Mike Robuck details the possibilities in this special report.