AT&T is using old people to market their new cellular-to-POTS bridge product.
The premise is she needs something as reliable as a landline, because during California wildfires the cell towers and power go down.
Maybe someone should have whispered to her that this product uses the same cell towers, or equally-vulnerable broadband. I could not stop laughing.
This makes me think that the marketing at AT&T is outsourced to a group that has no idea how the service works.
From the user guide[1], it appears to be a dual-WAN setup that uses both cellular and broadband. Not as good as decent POTS, but better than just cellular or broadband.
https://www.att.com/scmsassets/support/other/att-phone-advan...