You cannot have both the hub connection and the wall socket active and you cannot switch back to using the wall socket, what VM can do is install an extension from the hub to a wall socket if you have an per-existing installation this will be charged at £99 as a non fault call out and you may have to wait as it is classed as non-essential work due to the current lock-down and VM are not doing non-essential work at this moment.
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Welcome to our Community and thanks so much for your first post - I just wanted to pop along to advise that the information provided by our VIP @DJ_Shadow1966 is indeed correct; as you have your landline via the Hub, the wall sockets will no longer be in use or be activated.
At the moment, we are not doing any non-essential home visits due to the pandemic - activating and installing extensions comes under this bracket I'm afraid.
As an alternative to using VM to link the phone sockets to the hub, you could see if you could find a reliable and reputable local installer to do the work since this type of work is not being done by VM at present. Most areas have local independent telecoms/data cabling engineers etc. who should be able to do that kind of work.
As an aside, are you aware that if there is a power outage, or the VM hub is offline for any other reason, then your VM landline phone function will also stop working which in turn means your alarm would not be able to dial out on the VM landline. Alarm companies usually now offer some kind of mobile/SIM dial-out connection powered from the alarm battery to get around this problem.