no way why would a four year old need a phone? they are too young its not like they would talk to any one. i got my first phone in middle school and that was because i rode the bus home and my mom would want me to call in case i missed the bus or forget the house key or something
i was not allowed to have a phone until i was 16 and i had to pay for the phone and service I'm almost 18 and still don't have one and have lived a happy life. (Yes eventually i will get one) I say a kid should at least be in there teens.