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When I got Virgin at my place a couple of years ago the phoneline they provided was VOIP.
They still had some legacy analogue deployments when I was last properly involved in this stuff. Once upon a time the cable companies would drop a figure of eight cable which had a couple of pairs of copper and a coax stuck together. The copper was jumpered in the road side box while the coax went into an amp/splitter thing. Perhaps all gone but the timetable will be different to the BT (Openreach driven) switch off.
Some more about BT at https://www.openreach.co.uk/cpportal/products/the-all-ip-programme
I'd forgotten about the exchange closure programme. Need to step up my exchange bagging, only been to about 20 of ~5,600. Need to get the ~4,600 before they go! Could be some great rides.
BT, including Openreach provided, analogue and ISDN lines are planned to be switched off by December 2025. Other licensed operators with their own network might keep going, eg Kingston or Virgin.
Whoever you have a contract with might supply you with a device with a voice port, eg on the back of your broadband router. There might be a cost.
I've been unable to work out what BT are going to do for services that can't get broadband or mobile. ATA in the PCP?