Going with Fibe TV, no can't use your router, alone.
The tech will install a single line to the jack location, if proper 1 isn't present. There 2 jacks for the modem/router and 1 for phone (even if u are not getting phone) 2 small lines from jacks to modem then cat5 or 6 from there to DVR (TV box). You could probably use your router after the Bell modem/router. Just configure the Bell unit for no WiFi