FIOS is NOT IPTV. It is basically cable service over fiber. So it is fast cable. IPTV works completely different and offers many advancements in the future. Some of FIOS pieces are delivered via IP but the actual video is delivered via standard cable processes.
There still a Telco and yes some of there stuff is cable based but not all but overall Telco's most of them use all the same kind of network. It all depends on where you live and how they have things deployed in that area. It will differ from place to place and depends on how they decide to provide their video service.