Following a Matte image

I am new to this (group and motion) so bear with me if I don't state things too clearly....
I have a matted image on a cell phone screen. It holds steady for about 28 of 30 frames and then the last 2 frames the cell phone image moves. I dont know how to adjust the matted image so that it stays or tracks with the movement of the cell phone for those last 2 frames. Any help wouild be appreciated. Thanks!

You can use the Match Move behavior to track the cell phone screen and match the movement of your matte to the screen. Check the documentation under the Help menu.