Cox Wireless Service Coming in March Cox Communications will launch its wireless service in March in three markets, starting out on Sprint Nextel's network while Cox works to build its own network. The provider of cable TV, broadband and fixed-line voice service announced in October 2008 it would add a mobile component to its offerings by building its own 3G (third-generation) wireless network. The service did launch in 2009 as planned, though only in three markets and on a test basis, using the Sprint infrastructure. Though other U.S. cable companies have had mobile offerings through partnerships, Cox surprised some industry observers by choosing the expensive and time-consuming approach of building its own infrastructure. That quest included buying its own wireless spectrum licenses. Rivals Comcast, Time Warner Cable and Bright House Networks are rolling out branded mobile data services using the Clearwire WiMax network, which they helped to fund. Cox is building its network usi...