How to find a phone line in a wall?

[mcast123]

I recently had my flat completely redone inside, new floors, central heating, windows, lighting, kitchen etc. So here I am, a month after completion and I've just had my BT line and broadband connected. The problem is, all four phone sockets that I had fitted are dead (no voltage or dialtone).

BT are saying the line is fine and they can see a "capacitor" on my side. I've been told I need to find the BT "master" socket and test the line there. I think the dimwit electricians have buried it behind a wall (they can't remember).

How would I find it without getting a BT engineer at £70ph to look?

 

[mcast123]

I've already been through 3 different parts of the plasterboard with a saw. The line comes up through a riser, the problem is there's no easy way to see where this comes into the flat. I've looked on the outside walls and there is nothing there.

This is the most *no disguised swearing!* annoying problem ever, I may have to tear up my new flat. I'm *that's a bit dodgy!* but the signal is ropey.