Sorry I should have been clearer: I am referring to "Sonic Fiber" which is their own infrastructure, not any kind of resold service which they do offer in areas where they have not deployed their own fiber infrastructure.

In the Bay Area they have fiber in SF, South SF, Daly City, Redwood City, Berkley, Oakland, San Carlos, Burlingame, Albany, Brentwood, and probably more. They are rolling it out mostly in areas with poles at the moment because the cost of burying is quite high.

They've proposed "microtrenching" in SF to reach areas with all underground utilities but so far the city hasn't been very interested and it isn't cost-effective for them to dig up the sidewalks to install conduit. I hope that will change at some point.

They own some fiber. They'll also sell you service using AT&T's fiber if that's what's there.

Yes.