What a Bunch of Controlling Jerks
The only thing that is important here is the militant conformity to a set of rules that were written withought consideration of special circumstances like this one.
I despise cell phones, you couldn't pay me enough to carry one unless one of my loved ones was going into labor or was in a war zone, and I despise this war, but we are speaking about fellow human beings that deserve to be treated decently.
The anal retentives who run that school should apologize to the mother and her son as well as changing the policy to allow all children to speak to any parent serving in the wars.