In theory, that should be fine. If your line supports a downstream speed of above 40mbps we should be able to get your service upgraded within 1 working day of the order being placed.
The upgrade would start a new contract with retention deal pricing, whilst competitive, we can’t guarantee we’d be able to offer you the new customer Unlimited Fibre Extra deal.
If you’re wanting to go ahead, my advice would be to sign up on Unlimited Fibre, wait for your service to go live and the cashback to arrive, then call us on 0800 013 2632 to put the product change through.
From 31st October 2022, I no longer have a regular presence here as I’ve moved on to a new role.