So with Plusnet can you have a Post Office phone ?
I have emailed them but no answer yet. Probably have to give them a call later.
That's an upside-down question!
You can have Plusnet Broadband on a Post Office phone line, yes. Or if you are on a BT (Retail) line and broadband on Plusnet, you can move the phone line rental to the Post Office, Plusnet, or a host of others. Even Sky!
You just have to make sure the service you move the line to allows you to have any ISP's broadband on it, not just the rental firm's own.
So some possibles above. Some not possibles are:-
Broadband not with Plusnet and phone not with Plusnet, you cannot move the line to Plusnet unless you migrate your broadband to them as well. Though I believe if you have both with Plusnet you can migrate the broadband out and keep the phone line.
Broadband not with O2 or Be, you cannot move your phone line to O2 or Be unless you also migrate the broadband to the same one. But if you migrate the broadband out, you have to move the line out as well soon after.
My broadband basic info/help site - www.robertos.me.uk
My domains,website and mail hosting - Tsohost.
Internet connection - IDNet Home Starter Fibre.