To follow up jchamier's comments regarding VDSL.
Keep in mind that every actual completion of VDSL provision to a customer requires the PCP (phone line distribution cabinet) to be opened up, the appropriate lines found, both the original phone line and the VDSL double-links.
If the FTTC provides say 100 VDSL signals, then the PCP has first to be opened to allow those links to be drawn in through underground ducts, from the FTTC.
Assuming that each customer-request for VDSL is completed individually, then potentially, the PCP would have to be opened up, disturbed etc 100 times. (Hopefully there may be some aggregation of those "jobs" - but no guarantee; and that would only reduce the openings, not the quantity of lines and the detailed work on them.
Prior to that, the PCP might not have been opened for years!
So a lot of handling and disturbance of other lines in the PCP, including possibly yours.
If you get the opportunity, watch it being done, in a vast range of weather, out in the open, awkward locations, vegetation growth etc.