SwiftSMS is not designed to be beautiful, or elegant. It's simply a proof of concept SMS app made in MIT's App Inventor. It sends texts normally using your carriers plan or credit, it does not use an internet service.
Normal operator charges apply for each text sent
When you press SEND, your message has been sent, although you will see no response. (see screenshots)
Email me if you have any questions about how it is made, or if you want source!