How are telephone lines wired?

It only takes two wires to connect a phone, but most house wiring contains four wires. The red and green wires are on the two center terminals of a normal phone jack, and the black and yellow wires are on the two outer terminals. This arrangement allows most normal houses to handle two phone lines very easily.

Can you move a phone socket?

If you do need to move a phone socket, then simply wire one to your master socket, even if its a case of it being a few inches away. If you ask Openreach to move the BT master socket, they will charge somewhere around £150. You may have to wait a fair while for the work to be done.