I am with VM. I lost my "proper" landline a while back, not because of the changeover directly, but because Virgin weren't maintaining their roadside switch boxes (in anticipation) and my landline became unusable.
My actual telephone is wireless, with two handsets. I had the primary in the hallway, the secondary in the main bedroom and a seperate, wired, handset (a radio/telephone/clock) via a splitter from the wall socket, with the line going up the stairs and round into the bedroom.
I have lost the ability to have my phone in the hall. I have lost the ability to have a phone in the small bedroom, unless I ditch my current instrument and fork out for one with three wireless handsets. The phone has to be directly connected to the broadband hub, which is in the livingroom. I used to have it upstairs in the small bedroom but had to have it moved downstairs, because it so often needed rebooting and because that was where my phone would have to be relocated to so they could connect it to the fibre cable for the TV (which they couldn't in the hall).
I had to move my laptop to my dining table as the little computer table with its ergonomic chair is now fully occupied by the hub, the phone and the battery driven "emergency phone" which will supposedly still work if the Internet goes down (it connects to a mobile network via the fibre).
Unfortunately, on two occasions since it was all done, the Internet has failed due to a fibre line fault - which has also cut off the phone and the emergency handset. I had no way of contacting VM to tell them there was a problem and was without any way of communication for several days, until my daughter realised there was a problem and contacted VM herself on my behalf.
On one occasion a recurring period of "low Internet signal" kept cutting off my landline, but the emergency phone did work. If anybody needed to ring me while it was out, they couldn't unless they knew the "mobile" number of the Emergency handset. They never even told me it wasn't the same number as my Landline when they installed it, so I didn't know.
The Emergency handset is supposedly only available to "vulnerable" people, i.e. people like me who don't have a Smart Phone because we are too old/stupid to use one.
I would like to switch from the overpriced VM internet to Toob, but they don't do phone services. I would need to sign up to a secondary provider such as Vonage (according to a Google search) to get a "landline" (VoIP - Voice over Internet Protocol) service.