For our users using a BlackBerry Z10 on carrier T-Mobile will have something to look forward to, come tomorrow, a 10.1 OS update. courtesy of T-Mobile. 

The software update will bring T-Mobile users on via OTA and will come packed with Wi-Fi calling and various other bug fixes. Naturally, any update is welcome and it’s pretty nice of T-Mobile to let the people know beforehand. T-Mobile users, are you ready? Give us your feedback once the update arrives!

Release Document