Only if that phone line happens to be CAT 5 or better cabling. Most phone lines are rated far less than that so the answer is no.
Just moved in to a new home in the UK, the developers fitted some Ethernet cables from my office to under the stairs. I want to herd wire the PC to the router.
The router and cable TV box (with virgin TV) are off the same cable in the living room.
Can I convert the phone line that runs from the living room to under the stairs, in to an Ethernet cable? I don’t want to sacrifice speed or capability here.