The only other case where you would have to pay line rental is if you have broadband.
enlli - Sorry but you are mistaken. VM BB does NOT need a phone line. It is delivered over the cable that carries the TV signal as well. VM sell BB as a standalone product and advertise the fact that it does not need a fixed line if you don't want one. In some newly cabled areas there is no option for a phone line because the cabling is of a type that can't carry phone signals but does carry TV and BB.
Superuser 2016/17 Use Kudos to say thanks Mark answer as "helpful" only when the problem is solved Please don't send me private messages unless I ask you to. I do not work for VM. The advice I give is based on my best understanding of VM policy and practice. You rely on it at your own risk.