After years ofon-again,off-again talks, it’s official: T-Mobile and Sprint have announced plans to merge. The deal values Sprint at $59 billion (the combined company would be worth $146 billion) and will give T-Mobile the reins, with the carrier’s John Legere serving as CEO and Mike Sievert continuing to operate as COO. Sprint chief Marcelo Claure will serve on the board of directors alongside Masayoshi Son, the CEO of Sprint’s parent company SoftBank. As for the ostensible reason for the merger? If you ask the networks, it’s all about 5G.