A child should in theory never be rung up, it's only if they lied about their age or it's in their parents name that they would be rung. All that happens is you get a text (i think possibly a call) from 118800 saying so and so wants to talk to you, here's his number, your number is never given out. I think it has been blown completely out of proportion. I don't think cold calling will happen because it costs ?1 to use the service.