I'd like to give this a higher score but you've got to allow for pristine excellence. MPB doesn't have that but it noses around in that area.
As you've read in other comments, the phone booth (until 2000) was real, the tales told in the movie are fictional. The very real phone booth inspired someone (you can look it up) to weave tales around a very unique phone booth.
The concept is something someone should have made up but took a niche of reality to jump start things. It would have been such a triumph for someone to cobble this together from scratch. But so much of fiction uses the hodgepodge of fact for a launching pad. No foul. It's how things work.
In the movie, it's one lady (suspiciously wise, lady) who calls the MPB ... and, occasionally, someone is there to answer it. When that happens, the ability of humans to be confessional with a disembodied voice (versus face to face with people we know)kicks in and the stories that create the film unfold.
It's a wonderful format and allows an experimental exploration of cinema on several levels.
It's just plain enjoyable and fascinating because it tinkers with something that exists in our world and something that tinkers with what we wish, might, possibly, perhaps, could exist in our world.
In reality, once the phone number for the MPB was out; everyone would be calling it, trying to connect with someone at that lone outpost and reduce its "special-ness" and "unique-ness" to lowest levels of mediocrity.
That's what we do. Something very special and unique shows up and we leap upon it, shred it, commercialize it, suck it dry of any meaning and slap it on t-shirts and bumper stickers, thump our chests and go looking for the next significant thing we can reduce to nothingness with our rampant and relentless egos.
This film takes a pause with a very special something that really existed and wonders what would happen if the honest human element got hold of it.
And a collection of stories come together.
When it's over, you might find yourself thinking about all the other things that could happen if we had a phone booth in the middle of nowhere that would ring at random times and have a disembodied entity on the other end that could help us find our way through whatever dilemma enveloped our lives at the moment.
Wouldn't you love something like that? I would.
I don't have the answers. I'd like to knock words with someone who might.
Nice foundation for a different kind of film. Fortunately; it's called "Mojave Phone Booth".
Worth your time.