on 22-01-2020 21:42
I have a really poor signal with o2 at my house. Outgoing calls I often lose people and obvious I'm not calling on wifi. However incoming calls will be perfect as though they're connected to wifi.
on 22-01-2020 21:48
A few have reported that a factory reset was required to regain wifi calling after the update.
OnePlus 6 (O2 & Sfr), Z3 Tablet (Three UK), iPhone 8+ (EE)
on 24-01-2020 09:32
I actually found the solution online.
Put your phone into flight mode.
Turn on wifi.
Restart the phone (normal restart not a data wipe or anything)
When the phone comes back on it put it into flight mode again and turn wifi on.
Its suddenly showing wifi calling again in status bar and settings under connections.
on 13-02-2020 08:43
I had the smae problem on my work Note9 - Wificalling stopped after hte upgrade to 10. Other stuff was broken too, so I did a factory reset and everything worked fine once set up again.