How to send SMS from an iPhone app without opening the SMS interface?

I am making an iPhone app, where the requirement is such that user should be able to send SMS from iPhone app without going into the SMS API screen (i.e. the modal view for SMS).

We do not want the user to click the "Send" button. It should be sent automatically.

The message body and message recipients are pre-fixed.

I am a newbie.

How can I do this? What should be done?

Please Help and Suggest.

Thanks.