When you refer Text in Church to a friend, your friends get 500 FREE Messages added to their account and you get 250 FREE Messages each time a friend becomes a member. It's a win, win.
Also, if you refer 5 churches, you get an additional 500 FREE Messages.
To refer a friend, you'll need your special sign up link. To find this link, go to Settings and choose Refer a Friend from the sub-menu. On that page, it be towards the bottom.