(A quick search through the forums produced only one duplication of this idea, I am sorry if it is something that has already been said a number of times)
The port-o-rotary looks fantastic but there is now way I would by one because it would mean always having to carry it around, or using multiple cell phones.
What would be cool (and cheaper) is a bluetooth port-o-rotary with the handsfree profile built in. More over the bottom of the phone could provide a felted cubby for small cell phones with a usb charging connector (which is more and more the standard)
Now these phones make a lot more sense, the only problem would be the danger of losing that elite quality that the port-o-phone now must certainly possess.