I don't think you have to have a call plan. I would check that out if I were you.
Re the router siting, how far will that be from the master socket, will a phone extension cable be used to reach it, and what were the Infinity speed estimates?
VDSL2 is much more sensitive to total line length from the cabinet, and phone extension cables can be a significant source of noise.
Kindness isn't going to cure the world of all its awfulness but it's a good place to begin. Daisy Ridley.
My broadband basic info/help site - www.robertos.me.uk.
Domains, site and mail hosting - Tsohost
Connection - AAISP Home::1 80/20. Sync 60000/15199kbps @ 600m. - IPv4