If you have poor mobile reception at your property and you struggle to get a decent connection through your phone line, we highly recommend the new Starlink system. Starlink doesn't require mobile coverage or a phone line and works as long as long as you have a clear view of the northern sky from your property.
Starlink will also allow you to make WiFi calls from your mobile or set-up a Digital Voice (VoIP) service so that you can make and receive calls from your existing landline number.