[life-and-quiet]

I understand where you're coming from, and there might not be a lot of great answers, but off the top of my head let's say we have a high degree of confidence it is the phones. A couple immediate next steps we could take:

1. Encourage education. Explain to young people early and often through a number of avenues that phone use can cause anxiety, depression, etc. Knowledge is power and all that. Will it solve the problem? No. But it might move the needle and save some lives.

2. Fund further and more detailed studies. Are there critical periods of child development where phone use is more likely to lead to suicide? Are there particular patterns of usage? Narrowing down the hypothesis space makes it much easier to develop more nuanced studies and more targeted interventions.