Sometimes mobile phones can not work due to a broken mast, however this may also be due to the insulation in our properties. If you do find this here is a list of options you can consider depending on your network. Some services depend on phone and contract type. MVNO which piggy back off other networks like Tesco Mobile don’t usually provide these features.
Vodafone – Wi-Fi Calling
EE – Wi-Fi Calling
3 – Home Signal or Wi-fi calling
o2 – Wi-fi Calling