Cablevision (NYSE: CVC) took its first step into the wireless world Monday, by introducing a Wi-Fi-only phone service, Freewheel, that its subscribers can get for $10 a month. But with its limited service--Wi-Fi works only where hotspots and wireless routers are available, and doesn't do handoffs the way cellular technology does--it's hardly a threat to incumbent carriers like AT&T (NYSE: T). Still, FierceCable Editor Dan Frankel points out, established wireless providers shouldn't ignore the potential of Cablevision's foray into quad-play service. Read his take on it here.