Even if one isn’t a master hacker, anyone can “hack”. It’s all about data.
Screw up the data. Make the data so wrong that it can’t be trusted and you’ve just made them throw out a complete system.
lets say if 100 people were being geo-investigated. Geolocation data was being levied in either an investigation or some sort of sting operation. We can say “I don’t carry a phone because it tracks me” or we can say “I carry a phone BECAUSE IT TRACKS ME!” Use that phone to feed them stupid data.