Hope Tmobile z10 has wifi calling out of the box !?
Cause remember when the 9900 was launched wifi calling didnt work !
and ever rep and tech i spoke with before anybody bought a 9900. said YES
the new 9900 " WILL HAVE WIFI CALLING " and it did not they gave us a bs excuses
it will be avai in a software update that tmobile sat on for MONTHS before they finally
released 7.1.0.284 which still has not been update yet !