I was a network technician for Verizon FiOS a few years ago. *We would
get many trouble reports regarding some alarm systems not working with
the FiOS phone service for some reason. *It had something to do with
internal wiring from the alarm box to the house copper wiring.
Hopefully you won't have that problem

my experience with FIOS SUCKED, the internet part worked fine, at the
time tv wasnt available yet..

the phone part was a nightmare........

echos, noise every 12th call or so, backup battery failure in less
than 4 months they wanted to charge me for that, my box beeped alarm
for over a week, drove us nuts, verizon reps didnt know there was a
silence alarm button.......

the the service was basically unusable, verizon held me to the
contract, refused to fix the problems, the worst the unusable noisey
call every 12th call finally traced to a bad router in the CO. to get
this fixed i had to call for 3 months, finally calling every business
day for 3 weeks only to be told every time it as my interior wiring,
even though tech number 1 noted problem reproduced with home
completely disconnected....

one road tech told his supervisor the problem was a bad router at the
central office, 3 months later a network tech finally called and fixed
it within 15 minutes.

moved the number over to copper, ordered verizon to STOP SOLICITING
ME.....

good luck with that repeated reps at door, got mad they woudnt leave
me alone, so i cancelled my outgoing call plan on my business
line......

idiots cancelled my entire outgoing line completely twice.

i changed phone companies over that and hate verizon.......

this is just a overview of the troubles i had, and misses a lot.

geez all i wanted was a working phone line