Communication is often so much more than just an exchange of words. The Sony Ericsson SO703i would seem to be proof of this, with its talking-point-quality aroma sheets. You can choose from 11 different-smelling attachments, depending on the mood of your olfactory system at the time. Just find the internal slot, slide the aroma sheet in, and you can enjoy your favorite smell while chatting away on your mobile.
Another area of choice is the series of nine faceplates that are available, allowing you to customize how the phone looks from the outside as well.
This model and its customizability are available exclusively for NTT DoCoMo customers.