So flashing it to the South American ROM will get me Cyan, and I'll lose WiFi calling (I'm not even using it on T-mobile, so I sure don't care).
I assume I could still hope/wait for the T-mobile update, put my old Sim in, and update it over WiFi, as an alternative option? My family is all on T-mobile, so this actually holds some appeal for me (i.e. if my wife needs a new phone,
and I am willing to let her use my 925 - but that means I have to use my iPhone 5S
)
I'm assuming this process is much much easier than the horrible android unlocking/rooting/flashing I've done in the past! S off? S on? What?? Arghhhhh!