Most networks have switched to IP based phone systems these days, still a bunch remain but expect them to switch too like how analogue TV went offline.
They all work on todays lines. Some GPO rotary phones might need re-wiring with a 3.3k Resistor added to the board inside if they haven't been converted but its very easy to convert one. Most of them are already good to go.
I'm not sure how long the BT Line will stay analog they are expected to change soon. You'd then need a special converter to run retro phones but I doubt any will exist for a while when all the lines have changed over.
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