Frequently, teens are driving cars without their parents present, so it is difficult for adults to monitor their cell phone use. It's easier to relax your rules as you go along, rather than suddenly introduce new ones.
Maybe try respecting your children idk. Sure, everyone makes mistakes, but I have never done anything to make it necessary for my parents to monitor me in the way that that they have.
Leave him or her with something to think about. Don't keep texting if your crush stops responding.
Explain that you won't take away electronic privileges if your teen confides in you about a problem. I have read my kids text messages when they were younger - until they got wise to the fact and password protected everything on their phones. How about the girl who jumped to her death after being bullied over text and social media?