Funny Billing

Paid Content reports that the Glastonbury festival sells song excerpts for 4.0 UK pounds (very expensive). The interesting thing is how they have to solve the billing. They send three reverse charged text messages in order to get their money.

It shows that you should not limit the price of a text message. People will find a way around it. But also that SMS is one of the few ways to bill someone, although I assume that this way of billing is not possible with every SMS provider. Especially the reverse charging will not be implemented everywhere. But what happens when things go wrong? Can anybody send reverse charged messages? Do I have to accept them as a user (I assume yes)?