I started using phone when I was in primary one. Though I only used it for calls and to play games.
Nowadays, what little children can do with phones, some adults can't. I like your suggestion of not allowing phones in primary and secondary school and in tertiary institutions, it should not be allowed into the examination hall.
One day, I was shocked when my little sister carried my phone and played a game that I had never played before. I was even learning from her sef 😂😂😂😂. I asked her who taught, and she said nobody. ewehe
LoL . The way those kids are smart enn.. it is well🤣