Are you sure there isn’t any safer ways of contacting your 4 year old child? I’m not a parent and i understand the worry about getting lost or hurt can be horrible but with all the reports about radiation.. my little brother is 5 and i wouldn’t want to harm his brain this young as they don’t know the real damage mobile phones can do. I’m not saying don’t go for it, just only give it to him when it’s really necessary.