Interesting mental gymnastics here - under no circumstances should kids have no phones, and of course we talk about full smart phones. Everybody should do their best to make it as child-friendly as possible (which goes against primary incentives of every involved corporation giving you that free software to use) because... it would be nice? It would be appropriate?

In ideal world those are all good expectations. In actual ugly world out there, seemingly getting uglier each day, its dangerously naive. We talk about children dammit, its first and foremost responsibility of parents to keep them safe from all serious harm. You want to have contact? Give them dumb Nokia and they can never use an excuse it ran out of battery, and if lost it will be cheap to replace.

Or whatever else, but don't give them full access to whole internet and then be surprised when they go straight to its ugliest and most addiction-forming parts. They face peer-pressure? Tough one, but having some mental resiliency already during teens is great for rest of life, and maybe the shallowest and most pathetic of peers aren't the best crowd to hang with anyway. And its not like any actual popularity is gained, just blending in a faceless crowd.