That's not how cell phone jamming works; it's not a real "jam" of all frequencies. I don't know how much detail I can get into, but essentially you pretend you'

That's not how cell phone jamming works; it's not a real "jam" of all frequencies. I don't know how much detail I can get into, but essentially you pretend you're a base station and you disallow all calls to that phone. So your trigger would have to be much more intricate than that.