I thought with Verizon FIOS power would stay on .
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No. It sucks. We were totally upset when Verizon forced the “update” on us. You need to mount a ridiculous battery back-up pack inside your house. And as all batteries, it’ll only last maybe 12 hours.
We kept our landline but it is not as foolproof as it was 10 years ago. Especially if power goes out indefinitely, like a few hurricanes and snowstorms have done for up to a week.
FIOS needs a ONT, a device in the house to covert them fiber to copper. The fiber will be on in a outage as it is like a land-line where it gets it’s power from the provider, however without power to the ONT no dial tone, internet, etc.