Calls not connecting while WIFi calling is on. (UK)

[Hudz]

I have an S25 Ultra runing latest software as of 25/04/25. I've noticed but cannot pinpoint exact time the issue started. I have no coverage issues with my network (EE) and never had issues with my broadband provider for 3 years (4th Utility).

The Issue:

So I'm abe to make and receive calls when WiFi calling is disabled as expected. When WiFi calling option is on and im currently connected to the network (EE) I still continue to connect and receive calls normally. But the moment I'm connected to a WiFi be it at home or at the hospital, making a call gets hung up immediately. If someone tried to call me call would not go through. 

I've contacted EE they have confirmed they have a record of my calls failing to connect with WiFi calling. They verified all my account (Esim) settings are correct and WiFi calling should be expected to work normally. I've found starting a call on the network then switching on the WiFi during the call the phone would switch over to WiFi calling perfectly fine, so it seems to me its the initial connection that's causing the issue?

WiFi calling is a feature I use a lot since I do spent a lot of time in and out of hospital where network connections are usually bad. I'm wondering if anyone using this feature has had any issues or if anyone not using the the feature on the same network as me could test to see if they have issues. 

For now I've just disabled the WiFi calling setting since its an easy workaround the issue for now. I do plan to walk into an EE store and switch back to a physical SIM incase that may change something. 

Looking forward to see what you think 🤔. Might be something I've missed or not tried yet. I thought I'd mention incase its important I have also recently purchased a SIM plan for my Samsung Watch Ultra.

I appreciate any advice thank you for reading. 

[TechnoSteve]

Make sure you're not using a VPN

[TechnoSteve]

Do not use a VPN when connected to an EE network, plus certain VPN's block internet traffic completely if not setup right, Kaspersky and Defender are a couple of troublesome ones.
When I was having problems thinking my EE speed wasn't as promised, it was a VPN that was at fault, I've got certain shopping sites protected but when the VPN kicks in, NOOOOOOO traffic at all. Disable all of your antivirus tools and then try
If you ain't using any VPN' s 🤷🏽🤭

[Hudz]

I haven't been using VPNs

[Hudz]

Unfortunately I'm having to delete the comments about everything working fine. Just found out only half the issue is resolved I can now make calls of wifi calling but i cant receive calls while connected to wifi.

[wualudius]

I have the exact same issue. Disconnecting and reconnecting from Wifi seems to temporarily fix it for me. Really annoying because now no calls come through to me when I'm at home and I only realise due to missed call texts. 

S25 Ultra with EE physicsl sim.

[Hudz]

I've changed to physical sim too still the same issue. Someone posted on Reddit about the same issue the were on Vodafone.

[Hudz]

Do you use a smartwatch with a sim plan by any chance?

[wualudius]

Yes, I have an esim in my watch also with EE.

[Hudz]

Ok so I'm wondering if anyone who doesn't have an issue does not have a watch sim plan. I think that's when my issue started

[Hudz]

Hey just a quick one I went to EE for a phone repair and they checked everything and said everything is working normally. They made me do a hard reset and maybe that's all I needed. I didn't restore any data this time and looks like WiFi calling and even call waiting are both working without issues. So try to do a factory reset as if anything changes for you too.