Though the tweeter in question says that the date has already been announced, by our count the date has, at best, been leaked.
There's a good chance that the BlackBerry Z10 will be one of the first LTE-enabled phones on T-Mobile's network, since they said they'll be flipping the switch before the end of the month.
@iamamirhasan A date has already been announced. March 26th... ^KC— T-Mobile USA (@TMobileHelp) March 20, 2013
Whatever happens, you can mark your calendar with confidence now. Any T-Mobile customers ready to get on the BlackBerry 10 train? How about those of you with the other guys? Are T-Mobile attractive plan options pulling you in at all, or do you need more confidence in network coverage?