Interesting Read!
For me, my parents waited until we are 16, when we finished high school before they gave us a phone. And I appreciate what they did till today because after I got into college with a phone, I realised how much of a distraction phone was, I had to enforce extra self-discipline on the usage of my phone, so that I won't let it distract my studies or affect my grades. But back then in high school, there was no phone to struggle with.
I suggest parents should wait until their children are out of high school before they give them phone, and if they must give their children a phone for any good reason before after high school. They should monitor the usage of the phone.