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The worst I can think of would be harassment, mischief, and maybe some kind of impersonation. Do you seriously think they'll go to jail for any of that?
The people who destroyed thousands of dollars' worth of property were the braindead idiots who were targeted by the calls, not the members of PrankNet. They trashed hotel rooms and so forth of their own accord, no one made them do anything.
If kids were involved and interested in their own education with good curricula and competent teachers, they would be to busy learning to text their BFF Jill.