Still waiting.
Vodafone (who provide my landline) keep telling me that I must move to this and they'll send me kit etc. for about the last 6 months. So far, zip.
I don't care. In my last house, I literally never activated the phone line (which somehow confused the people that the landlord had tried to sell out too and who forcibly switched my electricity to them without my consent - they made that illegal shortly afterwards - and who wanted me to use their satellite TV and their broadband and their phone... I literally activated none of them and switched my electricity away immediately). That was 6 years ago.
Last year I bought a house, the phone line was active and I used it for broadband (because it was so rural, but I'd been living 4G-only for many years already). I still don't know the phone number to this day, and I've never bothered to even connect a phone to it.
And Vodafone will send me "adaptors" that plug into "my" router. You know, the one that I put in the bin as soon as it arrived, and put my own router with all my previous config on it on instead and made them give me the ADSL login details. So those adaptors will end up in the bin too.
If I'm feeling bored, I may ask for the SIP login details for this Digital Voice thing (which is just a SIP line in reality) and plug it into my already-SIP-capable router which has analogue voice ports for handsets too. I still won't plug in a handset, but you never know - I might one day bother to have it answer the line, tell people that there's nobody on this number and then hang up.
I don't decry the loss of analogue phones. I've been getting rid of them at work for 10+ years at least. I don't see the point in them in the modern age, especially for the cost of maintaining that line. And if I thought that the SIP-over-wifi and the backup of a 4G / GSM signal (on a dual-SIm phone) wasn't enough in an emergency (in a day and age where you can tweet for help or text 999 or similar), I could just sign up to something like Starlink or similar. I live in a very rural place, and have perfect views of the sky across a huge arc.
Oh, and my kit is not only UPS but running off a solar battery bank too. It can maintain the whole cabinet in my house for many, many hours as well as my laptop, NAS and CCTV. But that's not why it's on a UPS or on the solar. If the power goes out for an extended period of time and there's an emergency requiring immediate assistance at the same time, and the phone lines are down and the wifi is down and the 4G is down - I will raise the attention of my neighbours, and then if it comes to it, someone can drive into town. Sure, not as fast, but already an extremely unlikely scenario.
To be honest, why people think that that UPS in the cabinet is any different to one in their house or office, I can't fathom. After an hour or so, it's going to be dead. So in a power-cut, you make sure you don't need an ambulance in the second and subsequent hours, right?