Just tried it and I can't keep it becuase of 3 reasons.

1. Doesn't go to conversation list.
2. The message and number you entered doesn't remove after sending message.
3. Most importantly, I don't want to keep going to the app to send a message. It would be great for the app to launch when you click on the persons name through conversation after putting the phone in potriat mode while the physical keyboard is closed.

Nice job though.