If there is a working service in your new home at the moment then you have the reassurance that the VM cable is in working order (rather than finding a cable that has been out of use for years and is untested).
The problem you might run into may be to do with how/when/if the existing customer's account closes. There are regular topics on here where the new customer moves in but the connection for the old customer is still going through its 30 day disconnection notice period. VM doesn't have the two customers logged at the same address so the new service can't start until the old one has closed. This can sometimes involve a delay while VM goes through a 'gone away' process with the former customer to close the account.
That is why you should have some backup options in place and ready to go. Are you in contact with the present occupiers to find out when their VM account disconnection date is?
Other than that, you would place your order for your new service, VM would send you the kit, you plug it in and you should be connected.
Again though, worth having the backup option ready as there are occasional topics on here about equipment going AWOL with the legendary Yodel delivery service.
Sometimes one of the VM forum team offers to look into these kinds of queries (they usually reply here within a few days) or they may just tell you to phone the VM sales line.
