Can't make any calls within the UK

[MSK2]

My phone won't allow me to make any calls although I have signal and strong Wi-Fi connection. It cuts off as soon as I hit call.. 
Can someone please help?

[bristolian]

A WiFi-connection only matters if you have no network coverage and am reliant on WiFi-calling.

A few questions here.. in no particular order... Are you in the UK or abroad? Is this a recent problem? Are you on PAYG or pay-monthly? Can you receive calls? Can you send & receive text messages?

[FIZZYLP]

Hello @MSK2 I think my mate @bristolian is on the right lines but don’t think it’s what’s causing this problem.

Just like @bristolian said Wi-Fi calling only matters if your connected to a broadband connection and this feature has been enabled, and will also work over 4G & 5G if your signal is too weak to make a call.

lets look at the SIM card on this problem, let’s try a different sim in that phone and your sim in a different phone like a friend or family member to see if it’s the phone or the SIM card.

does this only happen to landlines or mobiles or both?

[bristolian]

Whilst the SIM could be the issue, a logical approach always helps in "I can't make calls" scenarios.

A network issue would affect all users indiscriminately - so ask friends or relatives locally, whether they have issues. If you can send or receive text messages, that rules out a SIM issue. A basic check is to see whether you have network coverage displayed - do you?

WiFi-calling works inplace of a mobile network connection.

[FIZZYLP]

I agree with @bristolian on the above ^

Unfortunately @MSK2 without more information we’ll be unable to give more then general information.