rainking430
New member
WiFi calling only works on Redstone branch, but it does work. So if you can stomach the risk, go ahead on Slow ring or Fast ring.
This may be true for you, but not for myself and many T-Mobile 640 users on Reddit and the MS forums. In fact, for most of us the Wifi calling toggle is completely gone in the latest Redstone builds. Unless you did some trick to get it to work?
Can you confirm with the new release preview how it's running and if wifi calling is working on a tmo lumia 640?
thanks
If you did take Davide's advice, just make sure you know the rollback path if you need wifi calling and can't be without it.