Why not have a phone with a "base" unit, a wireless headset, but also a wireless keyboard/keypad/display? (possibly as up to four seperate items).
This would mean that the base "phone" could be a very small form factor and optimized for signal strenth (both of cell signal and bluetooth).
The other devices - screen/display and data entry - both voice and text/numbers - could then be optimized for the specific power and form factor requirements for them.
Clearly this would not be the current form factor, but probably would be appealing to many users, could allow each form factor to be customized for certain circumstances/fashion needs, and would also work well for in car (or other spaces) devices etc.
It also leads to another thought I will post seperate, pc's with cell phones built in...
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Would be too cumbersome having all those bits to mind, and keep charged, although I do get your point.
Heinlein wrote about it in the 50s. Read the first page of PUPPET MASTERS for a reference design.
I say that the wristwatch should only have the caller ID and minimum hard buttons (the ignore/snooze-answer buttons, arrows to navigate through a phone book...)The snooze-answer button is another igenius idea that came to me. It makes your phone ring an extra number of times, so that your answering system doesn't pick up. That way you can give yourself an extra 30 seconds to prepare to answer (to dry your wet hands, or to go to another room, etc.)
Obviously bluetooth will communicate through all your cell communication components. You can replace/upgrade them as needed.
The actual phone with the battery should be your belt or maybe some holster-type set-up. Then, very importantly, the belt should also have a snap-in head-set. It fits flush into the buckly or where ever seems convenient.
When you get a call, you feel the vibration/hear the ringer. You look at your watch to see who's calling (I usually screen most calls). If you want to ignore, you press the button on your wristwatch. You also could hit the snooze button, and turn down the volume of the car stereo. If you choose to answer, then you pull out of your belt the headset, and press the answer button which is on all bluetooth headsets.What do you think about that idea?