Took the plunge...

[Tacitus]

If you're on FTTC (VDSL) all that will happen is that the dial tone will disappear off the line. IDNet will have to make sure that the DSL isn't cancelled with the phone line. Essentially your line will become SoGEA (Single order Generic Ethernet Access).

That's pretty much what I thought.  Moving the Broadband shouldn't present a problem, it's the tie-up with the phone service that could be difficult.  I currently have a FritzBox and a Gigaset N300A which have been working without problems for a while now.  The Gigaset should do VOIP so it may not be too difficult, although iDNet keep saying they won't support any of that and I'm on my own. I expected that since I've always used my own router since I first moved to iDNet, but they do seem to be emphasising they'll only support their own supplied kit rather more than they used to.

OpenReach can then reclaim the copper pair from the exchange to the cabinet, but probably won't take the cable to the scrap yard until some time after everyone's off it.

Doubt that will happen for a while.  The obvious thing would be to remove the copper when they install full fibre, but I doubt that will happen anytime soon.

[Tacitus]

Have you tried WiFi Calling for the mobile?  I also have a poor signal at home and that's certainly improved things for me. 

Yes I do use WiFi calling, since the mobile signal is pretty much non-existent at times.  This does mean that with VOIP, a power cut will kill the whole setup unless I get a UPS.  I have tried sims from other suppliers but they're all about as bad.

[Simon]

Yes I do use WiFi calling, since the mobile signal is pretty much non-existent at times.  This does mean that with VOIP, a power cut will kill the whole setup unless I get a UPS.  I have tried sims from other suppliers but they're all about as bad.

I have a main UPS, which is this one:

https://amzn.eu/d/9ttshku

I also have a mini-UPS to back up the Fiber ONT, which is in an outside cupboard downstairs from the flat:

https://amzn.eu/d/6UYMkac

I didn't think of that at first, and wondered why I lost t'internet in a power cut, even thought the router was still powered.