This mostly depends on the child's parents. They usually don't get cellphones at a young age because they're afraid that they'll lose it, have it stolen, or call unknown people. By that, I mean they could trade cellphone numbers with a completely random stranger online, which could possibly be a child predator.
That's one thing. Another thing is that in our current society, children are becoming more and more addicted to technology rather than spending time with their parents and/or go outside more. This leads to fights and arguments in their homes. Frankly, a cellphone should only be given to a child when their parents think that they are mature enough to handle having one.
