Advice on removal of suspected telephone extension cable

[ZeroTools]

I have an unsightly cable that runs around the outside walls of my house which I would like to remove. I suspect it is running into a pair of extension sockets that we do not need as we have wireless phones (the cable has been there since we moved in). I wanted to check people's opinions before I go ahead and remove it though as unfortunately I can't be 100% sure that's what the cable is for as it disappears under parts of the roof, meaning I can't fully trace it.

With reference to the attached photos:
The thicker black cable that comes out of the plastic pipe in the ground is (I assume) the supply cable from the street. The brown cable runs off to a point in the wall immediately behind where the master phone socket for the house is located (downstairs office). The thinner black cable is the one I want to remove. This runs up and along the walls on the front of the house, disappears under the roof but then looks like it re-emerges on the back of the house and runs into a point in the wall immediately behind where there is a phone extension point in the bedroom. Somewhere along the way I think it also branches off to an extension socket in the conservatory which comes out of the ceiling.

I'm 99% sure it's safe to remove, however I just wanted people's view. Also from looking at the way it's wired, can I just snip the cable at the plastic connectors (they don't seem to be removable without breaking them), or do I need to properly terminate the connections from the brown cable in some way to avoid issues with the master phone socket?

Any advice gratefully received!

 

[ToastyToes]

Looks okay to remove if you don't need the supply.
You can always cut the coloured cables from the black cable you want to remove and if something dies then use a check connector block to reattach it.
If it's telephone theres no electricity running through it. I did the same for my house because I don't want a landline so no need to have a cable strung around the house.

 

[bernardgreen]

There are two pairs in the incoming cable ( from the street ) and both have been connected. Hence there are two phone lines coming to the junction box you have removed. One of them is yours. The other may have been a second line to your house and that service has been disconnected. Or it may be an active line to an adjacent property.

The junction box is the property of OpenRearch and should not be tampered with. If you do cut an active line to a neighbour then the repair bill from OpenReach to you will be expensive.

 

[ZeroTools]

There are two pairs in the incoming cable ( from the street ) and both have been connected.

That's not actually the case, it just appears that way from the photos. The black and green lines from the supply are not connected to anything, they've just been twisted together and left unterminated. The only lines I'm looking to snip are the 2 blue and white ones which join the black cable I want to remove to the brown cable. Also it's not a junction box I have removed, just a plastic cover.

 

[bernardgreen]

My error. ( can't find SpecSavers either )

Almost certain you can do what you propose without any harm.