The current change is described as 21CV. Your line uses the TEL sockets on your hub, not the Ethernet.
All it actually does is replace the copper twisted pair analogue line between your house & the nearest fibre node street cabinet (where it converts to digital) with a digital link direct from your hub. Nothing else changes. It still uses a bog standard PSTN exchange like it always has done. The full VoIP switch does not happen until 2025.
VM BB TV Landline. Vonage 2nd line. Freeview/Freesat HD, ASDA/Tesco PAYG Mobile. Customer since 1993
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