Seems wise to experience at least a little bit of “functioning as an adult in the world” independently of phone habits…
It seems like, in this situation, we watch primarily non-phone-enabled virtues save the day: a clear sense of right and wrong, assertiveness, courage, steadiness in a tense situation, an attentive social environment with bystanders who both noticed and backed each other up…
Even having practiced some of those skills in moving through the world, I worry that, if I were a phone-carrying person, I’d be tempted to “just record it and let the internet sort it out.” Which is orthogonal to fixing the wrong in the moment.
The severity depends on where you are, even within a country, but in many places you can't authentically "function as an adult in the world" without a phone, unless you want to roleplay an adult from the previous century.
In some places, payment requires a phone. Tracking unreliable public transit requires a phone. Getting rideshare requires a phone.
The issue probably isn't the phone but letting them outside in the first place.