|You may find this useful. Gives you some ideas as to what is possible. Most of these mods require that you have an NET5 socket. That can be identified by being in two halves with the BT logo in the top left hand corner. The bottom half belongs to you and you can do what you like with that. The top half belongs to BT and you cannot touch that, not legally anyway.|
However, if you dont have an NTE5 socket and you have the older LJU2 socket there is information there as to how to fit your own NTE5 socket. You can do this now that BT have had the monopoly taken away from them but you must still retain the master socket as fitted by BT.
The I-Socket described does have some effect as it has a filter that can eliminate a lot of interference, especially is you are in electrically noisy area.