One cannot overstate the importance of this phone. This, the BlackBerry Z10, is the device upon which the fate of BlackBerry (formerly Research in Motion) hangs. That’s not to say that the company will disappear if the Z10 — and the BlackBerry 10 OS that it contains — is not a mass-market success. But if this phone does not do its job of extending the reach of the ‘Berry OS beyond those die-hard loyalists who have clung on to their Bolds and Torches and Storms, it’s safe to say that BlackBerry is in for some very hard times.