Comcast said it probably won't increase its investment in Clearwire (NASDAQ:CLWR), comments that come at a time when the mobile WiMAX provider likely will need more cash to continue its network expansion. Referring to Clearwire's strategic direction, Comcast CFO Michael Angelakis said at the Goldman Sachs Communacopia XIX Conference that Clearwire "has to figure this out," and will do so without more financial help from the MSO. Comcast, which holds a 9 percent stake in the company, has been reselling Clearwire's service under the High-Speed2go brand. Majority Clearwire stakeholder Sprint Nextel (NYSE:S) has said it does not plan to buy the rest of the company, and would prefer that Clearwire focus on building its network instead of pursuing direct-to-consumer efforts. Article