Apparently Sprint's none too concerned about recent complaints from the likes of John Deere and the federal government about LightSquared's potential interference with GPS signals. A letter obtained by Bloomberg reveals that Sprint has signed a 15-year deal with Falcone and co., agreeing to share network expansion costs in return for a slice of the sweet LTE service. According to the document, "LightSquared and Sprint will jointly develop, deploy and operate LightSquared's 4G LTE network." The report comes on the heels of rumors of a $20 billion agreement between the two companies. Unfortunately for both parties, no amount of billion dollar bills will shake impending scrutiny from the FCC.