The issue should be a simple one but the problem, often reported on here, is the wide-ranging skills/abilities/knowledge/interest of the individual people VM sends out to do the work. Sometimes reports on here recount that the individual technician who turns up had little interest/knowledge in how to do the job. Other times the customer reports a knowledgeable and helpful person turned up and everything was accomplished without issue. Which kind of technician you get seems to be a bit of a lottery.
Other factors include the time allocated to the tech to do the work often may not be enough for the task and the customer might not accept the rewiring work involved if it is too disruptive.
VM should be able to rewire the existing extension sockets so they work in conjunction with the phone line from the VM hub. This means all equipment stays in the same place. Due to the issues above though, VM often pushes the idea of moving the hub as it might often be a simpler task for the technician (though of no great benefit to the customer). Doing that, however, can change the wireless signal distribution in the home and often customers have equipment wired in to the hub nearby (such as a home office setup) so moving the hub is not an option.
Alternatively, a cordless phone system allows you to use phones around the home with no wiring modifications or disruption. Plug the cordless base station into the VM hub and use the cordless satellite phones around your home as required. If you already have a cordless system, you may be able to add in another cordless satellite phone to the existing setup as/if required. If you needed to buy a cordless phone system, to avoid any rewiring work, this would be at a cost to you.
