I’m using an iPhone 16 provided by ID mobile and having set up everything for WiFi calling and looked at other threads to get help I still cannot get WiFi calling to work. It’s so frustrating.
 

My iOS is up to date, WiFi calling is enabled and I can receive text messages with no problem.

If I dial out while WiFi calling is enabled nothing happens and if someone calls me while WiFi calling is enabled it just goes straight to my voicemail.

For now I’ve just disabled WiFi calling but as normal phone service is poor in my house (despite Id mobile saying it’s excellent) getting this feature to work would be so useful.