T-Mobile is back in play, after a long delay. In 2011, AT&T's attempt to buy the telecom services company was scuttled, after it was said to be anti-competitive by regulators. Now, the bid is back, but it's coming from Sprint, which is getting a boost in its own share price as investors cheer the latest in a series of tech mega deals. Going forward, this deal, no different than rumored plays by Comcast and Verizon, will see regulatory scrutiny. But that's no matter for T-Mobile shareholders right now: the stock is up 60 percent over the last 12 months, and it's our Chart of the Day.