repeatedly contested and eventually shot down, but now Sprint, its long time partner, will indeed be cutting ties with the wireless start-up. According to the Wall Street Journal, the move will officially be announced on Friday, leaving LightSquared alone with its dreams. A representative from the start-up says its filing a 150-page defense of its network on the same day, hoping to refute the Feds' claims that its network interferes with GPS signals. The outfit made no comment on Sprint's plans, but mentioned that it has enough funds to operate on its own for several quarters. We'll let you know when Sprint officially drops the ball.