Landlines too.
(Yes, those were used in the movies.)
Yes!
And then much of the cell phone network goes down! [Here! In The Real World!!!]
In-universe, it's a simulation based on the year 1999, "the peak of human civilization." Cell phones were expensive and rare, and did not have cameras or internet access.
...
(Makes me wonder why Y2K fears don't figure more prominently in it. 🙄)