So much for T-Mobile's bid to rescue a potential merger with Sprint. The two carriers have ended their not-so-secret merger talks after they couldn't find "mutually agreeable terms." Neither side is specific about what went wrong, but their remarks suggest an uneven power balance. T-Mobile's John Legere said a union was appealing for a "variety of reasons," but that a deal had to provide "superior long-term value" for a network that was already doing well on its own. Sprint had the support of its owner SoftBank, but its statement was more conciliatory; it wouldn't say much more than that it was "best to move forward on our own."