Back in the early 2000's when phones were barely getting smart and phone companies were charging for text messages like they were solid gold, I made a j2me app that could send SMS-es over GPRS trough a website that was offering free SMS-es. That way you could send 10 SMS-es for the price of one.

The app got some traction in my country. At the time ICQ website also had an option for sending free SMS-es. So I made an international version witch got featured on some blogs. But then within a week I got a cease and desist email from AOL lawyers. So that was the end of that.