QAFor folks who live in a Verizon FiOS area and their home already has a FiOS optical network terminal (ONT) installed, then yes, Verizon FiOS TV is a great option for folks who wish to continue using their CableCARD TiVo DVRs with cable TV service. As pointed out above, Verizon is using a new 2 gig-capable ONT for new installations in NYC and, if not already, very soon throughout the rest of their FiOS footprint, and this new ONT does not support CableCARD as it can only translate the incoming QAM-based FiOS TV service to IPTV on the local home network. (They say that FiOS TV is "coming soon" for customers with the new ONT. We'll see if that ever actually happens or they decide against it and just try to sell those folks YouTube TV or Hulu Live, as they already do on the Verizon 5G Home service which I'm currently trialling.)
As for Frontier, from what I can gather, they no longer sell any form of Frontier-branded TV service to new subscribers anywhere in the country. I'm not aware of them yet shutting down either Frontier FiOS TV or Frontier Vantage TV (formerly AT&T Uverse TV) in any markets, although that may already be underway. But if you don't already have Frontier FiOS TV, I think it's impossible to order at this point, as Frontier only wants to sell you broadband plus streaming video services like YouTube TV or DirecTV Stream (both of which are offered on the Frontier website). I'm sure it's only a matter of time before Frontier does the same thing that another telco, CenturyLink (Lumen) did in 2020-21, and completely shut down operations of their own pay TV services.
People that are in denial that QAM isn't going away need to wake up. The retail sales of the cable version of TiVo devices are withering on the vine.I've posted on this topic in a few other threads here, so I'm not going to put up all the evidence/links again, but it's clear at this point that Charter plans to implement "high-split" upgrades to their network that will allow much higher upload speeds. In order to do this, cable operators typically find it necessary to shut down QAM TV. Charter's CEO stated back in January that they would implement high-split in a number of markets in 2022, with others to follow after. Now, IDK, plans can and do change, so we may not see the first Charter markets have QAM TV shut down and high-split upgrades until late this year, or even early 2023. But it's coming.
And when it happens to your market, it's bye-bye CableCARD, as that technology can only work with QAM TV, not streaming IPTV (i.e. the Spectrum TV app), which Charter is transitioning to. It will likely take Charter a couple years or so to work their way around the nation to do these upgrades everywhere. So maybe your TiVo will stop working with their cable TV service in 2023. Maybe in 2024. Maybe in 2025. But I'd be shocked if it lasted until 2026. Because the mid-split upgrades are a sort of "hold-over" improvement to DOCSIS 3.1 until the next-gen DOCSIS 4.0 tech is ready to be deployed, which will allow them to offer symmetrical 10 Gbps internet service. And that's looking like it'll be ready for widespread deployment from Charter, Comcast, etc. in 2025, although I wouldn't be surprised if we didn't see it happen until 2026.
Comcast is only doing mid-split, rather than high-split, upgrades to D3.1 right now and the next couple years. So it looks like CableCARD will likely continue to work with their cable TV service until they roll out D4.0 in initial markets in 2025/2026. (And if it goes like recent network upgrades have, Comcast will start those 4.0 upgrades in Chicago, Nashville and Atlanta. We'll see.)