That is a real problem, but at least you were able to keep her off one until eight and I think that helps a lot - younger is far worse.

My kids are older (so the pressure was less a few years ago), and home education helped a bit (less school pressure, lots of parents with different rules to each other) but eventually I had to allow usage of of some things I was not happy with because that was where her friends were and how they arranged to meet up etc.

There are practical advantages to being able to communicate, especially when out alone and needing to be picked up or something. A dumb phone will do that perfectly well, of course.

Schools in the UK are banning (and state schools have to) the use of phones during school hours. The problem is that there is increasing need to use phones out of school. My daughter (when she went to sixth form college for A levels) needed a mobile app to use monthly bus tickets which were much cheaper, for example, and this sort of thing is getting worse.