BT have removed support for Signal Assist from with June 2022.
I received NO notification this would happen and wasted time trying to get it woking!!
So every EE or BT mobile customer with no mobile signal must now use Wifi calling and trust unreliable internet to connect mobile calls.... this is the wrong decision and they need to work harder filling in black spots were there is little or no coverage.
My community is 5000+ people with businesses and many new housing developments... yet they continue to advertise the best mobile network!!
Thanks for that Andy. Real problem for me as well. Local mast burnt down before Christmas but was pretty poor anyway and EE do not seem to be bothered about repairing it. WiFi calling nothing like reliable enough so going to find another provider. Wonder if I can skip out of contract as service has been withdrawn.