What the ...?!
Sorry, guys, I meant cell phones when I said handy. Where was my mind again? : /

So it really is called micro payment. As I mentioned before, that forum used payment via cell phone (now it's right). You call a number and wait until you reached the amount you want to donate. At the end of the month, the company transfer the money to you. At least that's what I think and - like tilt said - it would be advantageous for both, the user and administrators. One call is enough to donate and the cost isn't high. Maybe there will be other users who say: "Oh, well ... I don't have much money but six dollars won't hurt me." and donate even though they have never donated before. I know there were many users in that forum who only donated via cell phone to get the premium membership.