So it wont work like Comcast where you get basic feed throughout the house but need a box for all the channels?
Comcast in my area has gone digital...all TV’s must have an “digital adapter” or cable box now...no more “basic” (ch. 1-99) on just the coax anymore (in Comcast/Infinity “upgraded” areas). AT&T U-Verse (& Fios?) can use existing coax (your leftover cable TV coax) as an Ethernet network to distribute IP TV signals to each TV and box. Or they can use Cat 5/6 cable (best). Each install will vary in quality due to the installer...I told mine to “go away” after he tried an “all coax” install (poor “home run” signal quality) and ran my own (neat) Cat 5e cable “home run” to the “NID” (phone box on the side of the house).
FIOS generally runs fiber to the box at your house. From there they can use Cat 5 or COAX. The usually use COAX for their modem. This allows you to split into the existing COAX in your house. You can get basic channels without a box provided you have a HD TV but there is no analog signal on the FIOS COAX unlike the cable company.