Really a nice start guys.... i just tested it and it seems to work well. my suggestions would be:

1) when the msg is sent, a notification says 'sending text to number'. there's no notification for sucess of sending. that needs to be there as user has no clue bout the success/failure. it could be a yellow notification script or if it's integrated to conversations, that should take care of this. or the app could close once the text is gone.

2) predictive text would be nice to have

3) touching the text area makes the qwerty keyboard pop up. it should not happen.

4) Minor - address area just shows the number and not the contact name.

that's all i could think of as of now.

thanks once again!