5g hub ZTE mc888 won’t allow WiFi calling

[Rural]

We have recently switched to Three. We switched from the standard broadband to the 5g hub because we are very rural and our highest speed on the line was 5mb. With the hub we are getting the fastest broadband we’ve ever had. But here’s the problem: it won’t allow us to use WiFi calling. We rely on WiFi calling because signal in the house is awful (old house and very thick walls). WiFi calling worked for us before but won’t with this hub. Can anyone help us with this?

[Hagadol]

Has anyone found out if Three 5G Broadband on a ZTE mc888 supports Wifi Calling from other networks ?

[JonathanB]

Hi @Hagadol,

We've been investigating a few reports of this issue. Can you confirm which network provider, and which models of phone you've been having trouble with?

Thanks,
Jonathan

[Hagadol]

I am with O2.

iPhone 12 Pro Max - IOS 17.4.1

I get WiFi calling on other WiFi Networks, just checked this a few moments ago. 

[Hagadol]

I tried O2 WiFi Calling successfully on 5 different WiFi networks today. Only on my Three 5G Broadband Hub it is not working. 

[JonathanB]

Thanks for this, and the other info. I'll pass feedback to the colleagues investigating. Hopefully that'll help contribute to solving this issue.

[Rural]

So we’ve just been back to the shop. One of the guys there tested his phone, which was not an iPhone, and Wi-Fi calling worked. Another of the guys there tried his, which was an iPhone, and Wi-Fi calling didn’t work. 
so it seems to be a compatibility issue with the hubs and iPhones. 

[Hagadol]

I really hope Three get on this quickly, there are quite a lot of people with iPhones !

Perhaps there is a change in the settings ?

[Rural]

Scrap my last comment. I’ve just tried wifi calling with a Sony Xperia and it didn’t work

[JonathanB]

Hi @Rural,

Thanks for this insight, most of the reports we've had so far relate to iPhones. Which model of Sony Xperia did you test?

Thanks,
Jonathan

[Rural]

To be far it was a really old phone. We’ve just tried it with a Samsung Galaxy and it worked fine. Just need to get it working for iPhones please 🙏