if like me, your landline doesn't work during loss of power, then you have to call from a mobile,
Or does that go to not planning yourself for when things go wrong and ensuring you have at least one phone in the house that works when the mains supply is lost?
The phone being powered by the 100V available from the BT network.
(you can buy one from Argos for as little as £5.99)
As for mobile phones they are of limited range and often during bad weather/power cuts, the network can be very busy, further to that the base stations are not usually equipped with generator back up, but with a battery & UPS system that often only lasts a few ghours, after which the mobile phone network fails.
BT exchanges BTW are all equipped with generators.
And of course you have to keep a mobile charged up which may require a mains supply, some could charge one in their car if they have a car that is and the equipment in it to charge the phone.
BTW most of the DNO's use a system that picks up an approximate location from the BT STD code the call s made from and can often accept a report without you having to talk to a call handler, this speeds up the response if there are widespread problems.
This option is often not available with mobile phones as systems cannot read the GPS data (if the phone is equipped) or it may be in a deifferent location to that of the outage