05-09-2023 22:13 - edited 05-09-2023 22:17
Plug a phone into the phone socket and call another number - if you have a mobile phone call that, and hang up before the voicemail kicks in or someone answers
the number should display on the mobile phone missed calls list, next to check ,call it back from the mobile
If you dont have a "landline" phone get hold of a cheap corded one from somewhere like tesco .
If you have a powercut and the mobile network goes down then ( until 2025 at least) you can use the corded phone to make and receive calls - I ( and others locally) have a corded phone as we have had a spate of powercuts lasting between 15 minutes to 12 hours or more that also caused the mobile phone masts to fail
07-09-2023 8:58
If you don't have a handset to use from the helpful posts by @seebee and @chilli2 have a look at the solution in this thread.
https://community.nowtv.com/t5/NOW-Stick/How-can-I-find-out-my-landline-number/td-p/520204