It’s been an annoyingly long wait for American BlackBerry (BBRY) fans, but it looks like they’ll soon be able to upgrade to the BlackBerry Z10. Unnamed sources have told Bloomberg that AT&T (T) will start selling the newest BlackBerry flagship phone on March 22nd, or one week later than earlier rumors had indicated. It’s unclear whether AT&T will be the first American carrier to offer the Z10 since T-Mobile has said that it would start offering the device sometime in mid-March and we haven’t yet heard when Verizon (VZ) will start selling it. Sprint (S) is the only major American carrier to announce that it won’t be selling the Z10 and will instead only sell the QWERTY keyboard-enabled Q10.