Do you mean generally once they’re school aged or while at school? I can’t see a reason a child at school would need to keep in touch with parents while at school. I don’t think I had to call home ever in 14 years of schooling.
- I won’t be able to pick you up today please take the bus instead
- don’t forget we’re going to Nan’s tonight so please come straight home
- it’s 5pm where are you?
- yes little Bobby Tables can come for dinner
- You left your hat at home, I’ll drop it off at morning recess
Setting up playdates are much easier and can happen much more often when the delay is not 24 hours.
But my point is more that for a long long time kids have been able to learn independence from family daily at school, in a very safe environment. There’s a lot to lose by availing them of the crutch of constant communication with and tracking by their family.