T-Mobile and its chief executive John Legere love bashing rival wireless carriers for a wide range of reasons. Among them, of course, has been the lack of truly unlimited data at Verizon Wireless and ATT. Both of the nation’s top wireless carriers still offer unlimited data to subscribers with grandfathered plans, but they slow data speeds after a certain threshold has been reached — a practise called throttling. Now, it looks like T-Mobile is getting ready to do a bit of backtracking as it prepares to begin throttling its “truly unlimited” data plans for some users. In a supposed internal memo obtained by the often-reliable blog TmoNews, T-Mobile stated that it will soon start throttling unlimited data plan users who use their