WiFi calling not working

[Floaty77]

Xperia 1 ii. Was using O2 SIM and had WiFi calling. Changed SIM card to EE, now no WiFi calling and setting disappeared. Contacted EE who confirmed they had WiFi calling set, but still no WiFi calling.

I have tried all the usual recommended fixes: reset phone, reset router, try in airplane mode but with wifi on, reset network settings and all have made no difference.

[TheGOAT]

@Floaty77 Update the software of your phone, if it's not working also, so it's related to the EE SIM card, you can navigate the network settings if there is a specific setting needs to be configured for WiFi calling with EE. Try also removing the SIM and inserting it again.