Telephone cable / junction

[Amylou1107]

Hi,

We have a telephone socket in our bedroom which I wanted to remove.
There is a white internal cable which branches off into airing cupboard and then into the loft (and I think then goes down into guest room as there is another telephone point in there)
There is also a black external cable attached which comes from under the carpet. I’ve followed this and it comes in from outside.
It appears it’s coming from some sort of junction box and this is then connected to the main telephone point.

How do I safely remove the telephone point in the bedroom? Can I just pull the black cable out and cut off at the junction boxes?

I’ve included photos.
Thank you.

 

[securespark]

Some of that looks distinctly Heath-Robinson, meaning done badly not by BT or Openreach.

But I can say that black cable is usually used where it comes in from outside, so if you have a socket where a black and a white cable are jointed, if you disconnect at that point, you will lose service at the end of that cable. If that socket works, do not cut the cable as you may do damage.