I am using Apple's documented methods for In-App SMS today (MFMessageComposeViewController Class Reference)
This shows a Compose Message dialog box with the recipients and the body (optionally) pre-filled. However, the user still has to push the send button.
The App, Vlingo, seems to have figured out a way to programmatically send from the composer dialog box. They pop a countdown alert (non-standard) when the ModalViewController (MFMessageComposeViewController) is displayed. After 3 seconds, the message is automatically sent and the view dismissed. I have posted a screenshot of this here.
Any thoughts on how they accomplished this?