I'm taking my own advice on this (although DD wears a bracelet with my # on it when we travel), but please teach your kids not only your cell phone number but also the area code. We came across a little girl on one of the jungle trails at AK last Saturday.....she was crying, probably 5 or 6years old and she had lost her mommy. She could tell me her mommy's phone number, but not the area code. Mom back tracked and found her, but I certainly learned a valuable lesson myself with that one!