Handphone = Flash Drive

I have such a silly question recently. Nowadays, so many handphones in market with variable choices of functions and settings and is giving us so much of conveniences. It is a radio, it is a camera, it is a video camera, it is a voice recorder, it is a mini internet connected notebook. Well, it seems like so perfect with just a mobile phone on hand.

One thing I wish to add on. As far as I know, I didn’t see this function in any model or handphone as at today. I am wondering is it possible for a handphone to become a flash drive as well? Is it possible to make this happen?