text: Another reason is for if someone else is picking you up instead of your parent. You should know ahead of time so you can look for a certain car, but without a cell phone, how are you supposed to know who is picking you up. If you don't see your parent when school is over, and your expecting them to pick you up, and you don't see them, you would more than likely just walk home if you lived close. If it was winter and you found out you could've had a ride home but didn't know because you couldn't bring cell phones to school, you would be angry with the principal.