My daughter did not get her smart phone until she was a tweenager, and making the hour long bus trip to and from school each day. Even at that point all she was able to do on her phone wad text and make the emergency phone call. DD has some basic rules to start with....no phone at social functions or while doing homework. If school confiscates the phone I will not be racing in to get it. Phone is up on the bench during dinner and after 6pm. Of course the rules have adapted over time but the core is still there.
Of course you have to love the occasional selfie. The one above she took just this last weekend.
I guess I still do not understand why DD takes so many selfie but from what I see she is respectful with her phone and photos so what more would I want.