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The socket is an Openreach one, not a "BT Openreach", as there is no such company.
You need to find providers that use the Openreach network.
I beg to differ the answer given by Keith Beddoe. I had my BT Master Socket changed recently by a BT Openreach Engineer, on the Master Socket it clearly shows "Openreach Mk4".
sorry but there is no longer a company called BT Openreach as that was changed years ago and is now just openreach
there is no such thing now as a bt openreach engineer