The frame has only three control buttons on its back: one for OK, one for left, and one for right. A friend sends you a picture text or an MMS, and you accept or reject it. If it's accepted, boom: it's on your screen and in rotation. The Cameo senses when you have rotated the frame, and rotates the picture accordingly.
Bear in mind that this frame has very limited internal storage--just 64MB. You can, however, insert a media card to play pictures from other collections in between the pictures received via text. But you have little in the way of controls. You cannot alter slide-show transitions or add music; you can, however, adjust the screen's brightness.
Text messaging junkies will appreciate this frame, but its $10-per-month subscription fee is certain to limit its appeal.