My son has begun riding his bike alone in the neighborhood, such as to the park, library or store (about a five-block area around our house). I got him a buy-off-the-rack phone at Target that gets reloaded with a card also bought off the rack. No phone plan, no access to websites where he can accidentally buy something because my credit card is on the record, my credit card is not on the record. I just wanted him to be reachable when he was out on his bike.