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There are 4 distinct telephone wires entering my house. I assume they each feed a phone socket in different rooms.
This is standard installation [...] only one pair is used, with one spare pair.
Concur with danny on that.this is standard installation. you have two copper cable pairs (=4 wires). only one pair is used, with one spare pair.
you therefore have one copper pair (local loop) back to your local exchange/switch.
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