Do you have kids in double digits?
Our senior schools (from age 11, "6th grade" in US term) literally mandate a phone (not a computer, an actual phone) for school, both to use in class and to receive homework assignments.
That's ok, they can borrow a parent's phone.
In class though?
I'd be very concerned if a school relied on a smart phone even for class work.
Yes. I have kids. I'm not in the US. My kids school sends homework using an app. I get it on my phone, take printouts etc. and my kids get the work done.