Cablevision System Corp said on Monday it would launch in February a wireless Internet phone service to give users an alternative to pricier data plans from cellular companies such as AT&T and Verizon. The "Freewheel" phone service, which runs on any WiFi connection, is an attempt by Cablevision to retain and potentially add subscribers at a time when cable companies are losing out to lower-priced, bundled TV and Internet services from telecom firms.