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Ah, thanks. I still don't understand the line 'I hear you singing in the wire', although the line 'I can hear you through the whine' must then refer to him eavesdropping on her conversations ...
The wind will cause the wires to "sing". The whine is just the noise powerful electric equipment often makes, most audible when you're close to it. So the imagery here is of him imagining a link to her through the natural/unnatural sounds of his everyday (and very solitary) work. It's not a creepy song.
UK phones are just using 50V DC across the pair (80V AC to activate the ringer). You can easily patch in to copper pair at any point between phone and termination in the exchange to listen in or speak onto the line. (I used to have to do this when I did some work at BT.)
FTTC (Fibre to the cabinet) means the broadband connection is only on the copper between the cabinet and the property, voice is still carried by the original copper pair all the way back to the exchange but the data portion is dealt with my a DSLAM in the cabinet and then data flows via fibre back to the exchange.