Wifi calling worked for a few days & then stopped. Though in settings wifi calling is switched on the homescreen wificalling symbol does not come on. Also call is billed like a normal call.Software is uptodate.
On my S10 wifi calling was working and also icon was displayed at the top. Suddenly the wifi calling icon which was earlier displayed beside the network signal at the top has disappeared though wifi is on & wifi icon is strongly visible.
On my S9 initially wificalling didnt work. After updating software also did not work. Then suddenly it started working without any additional intervention or further update. Positive surprise.