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The builders should have made a box inside the house to fit the socket, and provided any cabling.
Openreach would then visit, on behalf of BT Retail, fit a master socket, and connect it up and test for dial-tone.
Are there no sockets near where the phone line comes in fro outside? There may be a blanking plate on it, with the phone wires coiled up inside?
Either way, you will have to report the problem to BT Retail, and they will need to get Openreach to visit.
Thanks for the response. The are phone sockets throughout the house, but nothing that looks like a master socket.
That is often the case, as they are simply daisy chained together.
Normally the one in the hallway, nearest the front door, will have the external cable coming in.
If you look behind the most likely one, you will see only one set of wires connected to it, with the external wires just hanging there if its not been connected up yet.
All the other sockets will have two sets of cables, one in and one out. All apart from the last one in the chain, possibly in a back bedroom.
A master socket should look like this.