WiMAX service provider Clearwire is reviewing its funding options from company such as T-Mobile USA or money from a wireless spectrum sale. According to the Reuters, Clearwire CEO Bill Morrow has confirmed the talks with T-Mobile at a Goldman Sachs Corp. conference in New York Sept. 23.

"In the event we don't come to an equity arrangement, they could be a wholesale customer. If T-Mobile USA does not become an investor, it would have to pay a higher rate for using the Clearwire network," he said.

T-Mobile USA is “one of many companies” that Clearwire is talking to, reports Bloomberg refering an email from Mike DiGioia of communications firm JLM Partners Inc., which represents Clearwire.

T-Mobile, which does not have required spectrum to migrate to 4G LTE standards is currently relying on HSPA+ for growth. T-Mobile is aiming to double it's HSPA+ footprint reaching more than 200 million people by this year with plans to offer 42Mbps theoretical speeds in 2011. However it may have to announce 4G strategy soon to remain in race with others.