I've reposted this at my blog, with all credits given. Plus ive added my own little bit too. You can see it
here.
Here is what i wrote...
When you sign up, there are some Terms and Conditions that you agree too. Firstly, the Checkbox that you select comes before the actual T&Cs, making it hard to see, and the Terms and Conditions appear in a very very small box
(screenshot). In that very small box, there is a
4,411 word agreement that you can only read
4 lines at a time. Then, at the
very bottom of the agreement, there is the following line...
"You may receive messages from SMS.ac or other users at any time. View pricing per country at..."
That means that if you send a message to someone, that person without choice gets charged a certain amount
(screenshot).
/ 
