If your child is missing, turn your phone to vibrate

This is an idea that recently came in handy. If you're out and a child wanders off who is labeled with your cell phone number, take your cell out of your purse / backpack / pocket, turn it to vibrate and carry it in your hand. The ambient noise at fairs or indoor playgrounds can often be so loud that it's impossible for you hear your cell phone ring.

This could save you a lot of heartache if someone is trying to call!