https://journals.sagepub.com/doi/abs/10.1177/2167702619859336?journalCode=cpxa
You can find many others by doing a lit search. But studies where they didn’t find much, or where what they found is mixed do not get much attention.
ETA: There may indeed be risks. Smart phones may indeed be bad for teens. But the article from the Atlantic is in the moral panic mode. I remember when the bogeyman was rap music with dirty lyrics, and before that video games, and before that it was television. And I have to laugh about all the hand-wringing over young people delaying sexual activity; the panic used to be that they were NOT delaying sexual activity!