I'm surprised that the kids that did have cell phones didn't offer to let the others make a quick call home. Just to let the family know why they are late..
At the very least the school should have called saying the bus would be late. I suppose it might be a hassle to make all the calls if it is a full bus still. Especially if no injuries at all...
The bus driver shouldn't have tried to make that turn around like that, they should know how much room they need for clearance.
So now the bus has damage and the school Ins has to pay for it and the other vehicle.