Assuming that you have no need for the extensions then yes. There is no electrical danger in telephone wiring.
It may be best to find out where the wiring comes from and disconnect them at source. Then you can remove the sockets and possibly pull the wiring through, or just leave it in place.
Just as long as the line doesnât ring when your in contact with the wires. You can get a (not dangerous) jolt. Been there and done that 
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Around 50V DC, only on a POTS line, not ADSL (although some of those are still hybrid).
Up to 90V AC 48-52Hz when ringing for France.
I can see where they come from but itâs high up a pole which itself is in a bush - the cover has come off the box so I can see itâs the same wires.
The fibre guy couldnât trace their route so didnât think it was worth trying to pull them through (they disappear underground and appear again about 75 meters away.
Are they likely to be « live »? - I know it will be low voltage / current so not harmful to me, but would I potentially short them out and trip something at the « exchange » if such a thing still exists?
And do I have the right to remove the boxes or do they remain the property of the original installer?
Thanks!
Possibly - if you have a voltmeter stick it between the âringâ and âtipâ connector - tip should be around -48v with respect to the ring.
As @hairbear says ringing works by superimposing an AC ringing signal for 60-90V on top of that so you can get quite an unpleasant shock if you grab the conductors when the line is ringing (and no shock can be considered truly hazard free).
Probably shouldnât admit it, but with our place I was sure that the phone had not been connected in years, so just snipped the wires outside the house and removed the wall box. Nothing bad has happened so far this year.
There should be a box on your premises somewhere. Itâs the master socket (DTI) that @Badger mentioned earlier. Not sure how long they have been used, so if itâs a really old installation it may not have one, although there should be some sort of box somewhere. You can actually safe all the telecom wiring by plugging in a dummy or just unwired plug into the DTI if you have one whilst you cut the cable.
This is what I have (now you can see why I want to remove it).
It appears that I have two DTIs, and Iâve just discovered the « test » bit rotates to reveal a socket (who knew!)
In the floor is a severed cable and an unsevered one, and cables from both sockets disappear into the wall.
My side cutters are well insulated 