Hello,
Simyo (ES) Network Operator is supporting WiFi Calls but, even if I enable WiFi calls at settings, WiFi calls aren't available.
I use 2 SIMs at my mobile, one with Simyo and the other one (a eSIM) with other Network Operator. The eSIM that isn't from Simyo shows 2 menus for WiFi calls: Calls preference (over mobile network or WiFi network) and Calls preference over roaming but the options from Simyo only offers the first menu (calls preferences) but Simyo (and other Spain Virtual Network Operators) needs to enable roaming. Maybe this is the origin of the problem?