Motorola RAZR D3 move application to memory SD
Root the device (in this case the razr d3)
Install the application (a game i.e.) in the memory SD.
Unroot the device (to have the last update of the S.O., i don't have find how to unroot an razr d3)


I don't have test this solution but maybe in a few weeks i will try it :)

Links: 

http://youtu.be/3WZBb4W0-ds how to root D1 and D3 device.

http://www.youtube.com/watch?v=0JA8TKNWTEk how to use GL to SD (root)

Well, basicly the problem is that we will avoid the warranty of the mobile.