Frontier Vantage? If so, I think that's just a rebranding of the U-Verse services they acquired in areas formerly served by AT&T. I guess they didn't want to license the name from AT&T, like like do with Fios from Verizon.
Well, the Frontier fiber in my area is old Verizon FiOS that Verizon abandoned and never officially launched in my market before selling to Frontier, and Frontier actually spent some money expanding it into new neighborhoods, so not sure which inherited tech it is, or if it is something else entirely. I don't know anyone who signed up for it. Either way, they stopped selling it.