As the copper network goes from stop sell to retirement, the expectation is that comms providers (ISPs basically) provide a solution for voice over fibre - (Voice over IP) - or as the case may be for the customer to organise this themselves with a third party VOIP provider.
Openreach no longer want to have direct responsibility for voice services. They no longer have a telephony port on the ONT and correspondingly they removed the battery backup unit from the ONT.
It’s quite a sea change in affairs. Fibre deployment is accelerating, copper is definitely going and with it ‘default’ voice service. I don’t really think the industry have communicated this very well up to now. They will definitely need to collectively step up...
https://player.vimeo.com/video/505623546
Openreach recently published the initial list of 220 areas that will begin copper stop sell from this June and presumably fully retired 2 years later. Let’s hope that as they move through that process and push to the next block of areas, plans are in place or get developed to support vulnerable customers or communities as fibre deployments accelerate and copper is retired.
Your particular situation with 12 hour power cuts, patchy mobile service made worse with atmospheric impairment sounds particularly challenging
though!