There are quite a few American movies/series from the 00s and late 90s where cellphones are rare or even non-existent.

For example in Bridge to Terabithia (2007), neither the schoolkids or the adults have cellphones, and the plot kind of relies on this fact. Sure, the film takes place in a rural community. But I grew up in a small rural town too (in northern Europe), and I got my first cellphone in 2002 in my early teens. Many of my friends got theirs a couple of years earlier around grades 4-6.

Another example is from Breaking Bad, where Walter White uses a payphone in one of the later episodes. The events in the series take place in 2008-2010. I was born around the turn of the 90s, and I don't think I have ever used a payphone. I have seen them though, maybe up until the late 90s or something.