https://www.techdirt.com/articles/20180410/10423439601/competition-killing-sprint-t-mobile-merger-nobody-asked-is-back-menu.shtml

When last we checked in with T-Mobile and Sprint's longstanding M&A dance of dysfunction, the deal had been scuttled after Sprint was unwilling to give up control post-merger. But something in the dynamic between the two companies (more specifically T-Mobile's German owner Deutsche Telekom and Sprint's Japanese owner Softbank) appears to have shifted, and the deal nobody actually asked for appears to be back on the menu (annoying Wall Street Journal paywall warning):

"Sprint and T-Mobile have rekindled merger talks, people familiar with the matter said, as the wireless rivals explore a combination for the third time in four years. The latest discussions come just five months after a previous courtship collapsed largely over who would control the combined firm. The talks also come in the midst of an antitrust fight between the U.S. government and AT&T Inc.