Getting a tiny phone not meant for media consumption is probably the closest you can achieve. You are not going to waste a lot of time watching youtube on a 3" screen, because that's just no fun.
The "jelly star" phone looks kind of fun. I just sat in a busy tram and wondered what the scene would look like if we all had phones like that. It's an innteresting thought experiment.
Well I remember the days before the first smart phone and taking subways in New York City, so it’s not too hard for me to imagine. People reading books, talking to each other, very different.
The thing is I'd still need my regular phone for various things and i can't cut the sim in half.
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> wondered what the scene would look like if we all had phones like that.
People with headphones looking absentmindedly straight ahead doing their best not to focus on anything, isolating themselves as much as possible to make the complete lack of personal space more bearable.
This is already what crowded subways in my city look like when you pass the threshold where people are too cramped to browse their phones. This is not a bad thing, just a coping mechanism.
I think there is much more room for behavior change if you consider people at a table (coffee or restaurant) with and without phones suitable for continuous media consumption or social network interactions.