WiFi calling stopped working, possibly after upgrade to iOS18

[ylexus]

I have been relying on WiFi calling for years, as reception at home is very bad. Approximately after I updated my phone to iPhone 16 pro max with iOS18 the WiFi calling stopped working. It activates for a short while intermittently and then goes down, and mostly stays down (judging by the WiFiCall icon next to the WiFi  symbol). As a result, I can’t make calls and all incoming calls go to voicemail. I did all I could find on internet: reset network settings, check for carrier updates, turn WiFi calling off and on, rebooting phone. 
My WiFi is on O2 and she has exactly the same issue. She has iPhone 14 Peo Max and I have iPhone 16 Pro Max, we are on iOS 18.0.1. 
Seems to me it’s some incompatibility if iOS18 with the mobile operator’s software. 
To make it worse, there is currently no way to speak to a human in EE tech support. From everywhere I tried I am just redirected to some SMS chat with 150 which takes me to a page which goes back to SMS chat. 
I have reported the problem to EE via network status page. But is there any way to talk to someone in support at all? Is there any way to fix this?

[FeeBee1978]

Hi Peter,

Thanks for your message. 

I am on iOS 18.2.1. 

FB

[Leanne_T]

Hi @FeeBee1978 

Thanks for coming back to us. 

Do you get the same drop outs if you connect to a different WiFi network? Have you tried restarting the router and iPhone? 

Thanks 🙂

Leanne.

[FeeBee1978]

Hi Leanne,

Yes, I have tried all the switching things off and back on again. 

It is dropping off of all wifi networks that I have tried. 

I also updated the software on my phone. 

Thanks,

Felicity 

[Leanne_T]

Thanks for coming back to me @FeeBee1978 

Have you tried a factory reset of the phone? You would need to make sure all data is backed up first as this will wipe the iPhone back to factory settings. 

Leanne.