I doubt that my grandkids know what a phone booth is, but their parents have landlines - at home, at office and cafe.
No they don't. Not the same ones that you had in your office or home in the 60's or 70's. Those are VOIP connections using the internet just like we re using now. If the router fails or loses connectivity, so do those landlines.
True landlines were not subject to IP points of failure. They just worked. 99.99999% reliability ain't what it used to be...and that's not a typo.
Welcome to the IOT. Ask your grandchildren what that means or just use use Google on your 'landline'.