There is no separation between operator billing and SMS as I understand it. An "operator billing" payment is simply a very expensive SMS. The differentiation al

There is no separation between operator billing and SMS as I understand it. An "operator billing" payment is simply a very expensive SMS. The differentiation all happens at the provider's end. This makes it a very flexible system, it has been in use pretty much since SMS became popular. How do you think those kids were paying for all those ringtones a few years ago? (before you could just put any mp3 on your phone easily)