Obviously it depends on how many devices you carry and how you prefer to carry them. When I had to carry two devices (a work cell and my n810) I put my work cell on my pocket with a belt clip and the n810 in my pocket. With the n900, I won't need the work cell and will be putting in a belt case on my pocket instead. Obviously it needs to be a vertical case, so I'm getting: http://www.pdair.com/catalog/product...ducts_id=24074