I'm actually even quite positive I remember hearing Mitnick wasn't allowed to use the phone in prison for some time because they were concerned he could initiat

I'm actually even quite positive I remember hearing Mitnick wasn't allowed to use the phone in prison for some time because they were concerned he could initiate some sort of military attack by whistling into the phone. I heard this around the age of 14 though- so it's possible my memory is foggy.