Thanks everyone. There are no other telephone sockets in the apartment, I'm sure of that, looked everywhere. There's one locked utility room on each floor of the building but again anything in there would be shared between apartments even if I could get access.
I'll take photos of the second socket tonight when I get home from work, front and back. The front is identical but maybe you can see something on the back that I missed. So far it seems more reliable but I've only been using it for one day.
most apartments or even 3 floor houses don't tend to have correct fitted phone sockets, they tend to daisy chain them with out a master socket (which is just a plan socket like in your photo )
they just put the sockets in and run the extensions off the first socket which is likely the one closest to the flat front door then that will go to a distribution point in the building where your individual line comes from (norm in the entrance with the meters)
if you take the plate off the one with 2 sets of phone wire will be your main incoming line and the other phone cable should goto the second socket with should only have 1 phone wire (the whole white cable of 4) disconnect the 2 coloured cables that goes to the other extension socket (norm green,blue or orange colored)
i had to disconnect so many daisy chained phone extensions so only the Main incoming phone socket is live (norm near the front door) its not funny any more but easy fix
on the other socket it should have 2 of them purple cables going into it (first picture shown is likely the extension socket from the other one in your house) and the one with the main incoming line should be a BT master socket (most likely near front door in flat any way so landlord should have no problems with it or you just dont tell them
from the picture you have shone its obviously not been fitted by a phone engineer as all 6 cables have been pushed into it (only 2 should be used)
Edited by leexgx (Mon 08-May-17 10:26:45)
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