It also depends massively on where you live - in my local area a lot of the school kids have one bus option and if they miss it, there isn't another one. This means that that 15 minute bus journey turns into an hour's walk. Not a problem as such, but if my kid took four times longer to get home than normal I'd be worried for all that time.
I agree @takealettermsjones . When DD was at school the only way to get to school was the dedicated school bus. The bus company the school had a contract with had old, under maintained buses that often broke down, and even caught fire on a couple of occasions. It wasn't really feasible for the children to walk for five miles on winding country lanes with no pavement, and therefore a phone was required. I agree with a pp that a simple non smart phone would suffice.
I think those advocating for no phone at all must live in an area with plentiful public transport.
I was smiling at a recent thread where people described how often they phone/message their undergraduate kids (many every day).
That must be so suffocating @VickyEadie
Both DD and I were ready for her to go to university. Our contact was as and when required.
It is down to us as parents to give our DC the life skills to be independent. I had always encouraged independence, as my mother did to us, and now, apart from help with the rent costs in her student accommodation DD is completely independent.
On the WIWIKAU Facebook page there are so many mothers (it is always mothers) who spent all summer sobbing at the idea of their DC going away to university. I am so tempted to tell them to get a grip. I don't of course, but being a clingy parent is not good and doesn't encourage independence.