If you are a content provider looking for a charging mechanism you might want to check out http://www.boku.com/
Looks like they’ve got a ton of carriers on board.
Only bad thing is 35% ‘transaction fee’, i'm actually surprised it is as low as that (carriers are greedy bastards) .
The devil is in the details and i haven't looked yet but if you are looking for an easy way to monetise online content in either a desktop web or mobile web (or just charging for pizzas using mobiles), then you might want to check it out.
P.S. Btw just as a matter of research thought I’d check out http://bango.custhelp.com/app/answers/detail/a_id/1178 their rates are higher (and varied country to country).
Ha Ha at the 60% transaction fee in some of those countries (yes thats right your app charges $2 you get to keep 80c - the rest is taken by Bango) - what a joke.