I would hesitate cutting the copper tel lines coming into your house. The old Ma Bells are trying to do away with copper all together, and prolly will do such between fiber and wireless. No sense in hurrying up the procedure. Call me old fashioned, but I find the old dial tone, a real tone over copper, re-assuring. Yes, I am an old fart. Former network engineer even.
When the kids got me DSL, ATT had to re-run the wires for the twisted pair. They didn't put them across the driveway this time. ;)
/johnny
tx