LightSquared says it has signed up five companies for its wholesale LTE service

LightSquared has faced something of an uphill battle in getting its wholesale 4G LTE network off the ground -- even including accusations that it's a threat to national security -- but it looks like it's having fairly good luck attracting some customers. According to Chief Marketing Officer Frank Boulben, LightSquared has signed agreements with five companies so far, including two carriers, one website, a national retailer, and a device manufacturer -- none of which it's able to name, of course. Boulben also revealed that the company, which plans to compete with the likes of Verizon, AT&T and Clearwire, is finished raising money for the "short term," and that it plans to begin trials later this year in Las Vegas, Baltimore, Denver and Phoenix once it finishes its lab testing in Dallas.