I live in an area with a very poor / non-existent mobile signal (EE). I'm told if there is a power cut there will be no phone connectivity with digital Voice. What am I supposed to do?
BT may supply a battery backup unit (BBU) if you ask them.
Even if they do not, you can get something similar from Amazon. Look for a UPS (Uninterruptable Power Supply). Basically, a battery that you plug into the mains and the Smart Hub, (& ONT, if you have one), then plugs into that.
If you speak to BT's customer services and explain about the poor mobile signal they will go over some alternative solutions to allow you to make calls in a powercut.
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There are also lots of posts on this forum with solutions and guidance along with lots of information at https://landlinesgo.digital