I think people have lost sight of the great advantages to a mobile phone.
In fact some can have a G.P.S which can help to give some idea of where that child is!
So by telling a child they must ONLY be used to contact the parent or police, and instilling that to them.
I only wish we had them when my sons now in there late 30's ...were young.
It gives a great deal of peace to the parent and also the child.Especially if you
place it in the child's school back pack, in a very safe position.One can always make a pocket for the mobile to be placed...You can never be too careful, when it comes to our children's safety.Instilling to your child it is only for that one use, is a must.When older, then as the child can earn their pocket money....it is a wonderful tool, for how to manage money.Buying PRE-Paid is the only way to go, so you and they do not get any nasty surprizes.