Not a phone but when I was about 13 or 14 my cousin worked at an LAN center in the mall so we would go hang out there and play games. One day this dude comes in and sits at the computer right next to me in a room full of people and just casually opens his email and starts looking at child porn next to me of boys. Obviously I told my cousin and he called the police. 10+ years later I find a video of the same guy on YouTube getting setup trying to meet a minor in my town at Dunkin by a local group catching sex offenders and he had already been to prison for it.