If your child has a smartphone, it is a good idea to institute some rules to prevent trouble before it starts. Janell Burley Hofmann, the author of book iRules: What Every Tech-Healthy Family Needs to Know About Selfies, Sexting, Gaming and Growing Up, has put together a parent-child contract that is a good starting place. While it is quite comprehensive, pick and choose the items that work best for you and your family, and think seriously about discussing every item on the contract with your kids.