Cornish Jack, suggest you perhaps have a cheap back up mobile with £10 pay as you go sim card and easy ability to top up - use that number for receiving unlock texts and so on... (tho you must receive/make a quick call from the sim every few months lest your card get cancelled).
...and it's advice I ought to listen to myself, my landline is history and Ionly have one mobile and a laptop... should be enough but... !
Anyone recommend a cheap and cheerful phone/sim?