Time Warner Cable left the door open for a possible voice service running over Clearwire's mobile WiMAX network, but said that it was still in the early stages of using WiMAX in its products. As one of Clearwire's wholesale partners--along with Sprint Nextel and Comcast--Time Warner has been offering its own branded WiMAX service, called Road Runner Mobile. Time Warner CEO Glenn Britt said on the company's fourth-quarter earnings conference that he believes the networks of the future will combine wireless and wireline components. Article