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The split Openreach sockets are very unreliable due to their over complicated design.
Failure of the phone connection is very common.
This is a suitable replacement, and a much simpler design, and very reliable.
Any extensions are wired to the back of the faceplate as shown below. Just use pins 2 and 5.
Its worth making sure that its not the phone extension wires causing the phone to fail. If you disconnect them from the back of the faceplate that you removed. Then replace the faceplate, see if the phones work.
If they do, then the fault is on your extension wiring.
Thank you for this is this hard to wire up it says use a punch tool? I am worried I will make situation worse then BT will charge.
No, that is only for any extension wiring on the back.
The normal master socket is not touched, this just fits over it, and plugs into the test socket. There are a couple of screws to fix it in place, its very simple and effective.
If you do not use any of the phone extensions, then the extension wiring can be left disconnected.
I am sure it will solve the problem. Please revisit this user forum if you need more help in the future.