Parental control app that allows you to cut off cellular data on a schedule

[steveg_nh]

So after much searching, I'm learning that Apple's OS restrictions make parental controls challenging. Sure, iOS has some built in controls, but nothing that allows you to limit access on a schedule. I thought Verizon's Family Base offering would do it, but when you set a time restriction, you limit not only data, but also all calls. I'd like to be able to allow calls for emergency reasons (without having to create a "trusted" list of contacts they can call), but limit data access while they are at school and during the overnights. App scheduling/management is a bonus, but not a requirement.

Any suggestions?

Thanks