I have moved your post to the more appropriate Home Phone board.
You don’t need any special phone to use VMs hub based lines. You certainly don’t need a VoIP phone. These use the internet sockets, not the phone sockets on the hub, & will only work with external providers like Vonage.
VM BB TV Landline. Vonage 2nd line. Freeview/Freesat HD, ASDA/Tesco PAYG Mobile. Customer since 1993
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