Mobile telephones become an inherent things in our life. Day after day the phone becomes more comfortable, smaller, it is operated on more and more functions so IMHO it will be some kind of pocket computer in closest future… even it becomes already.
Anyway there are different models of phones even you can carry it at your wrist like bangle. But if you want to have enough size of screen...And sometimes you may need to set it aside, for example at office or home… well you can be located far from it and don't hear the ring. You can miss important call than.
So I offer to make mobiles with additional devices that will be similar to watches but there will be special chip that will give you information about calls on your mobile and no matter how far you are, you will be able to know about calls. It is some kind of remote ring… Well I suppose that this watch will be able to work as call line identification, voice mail and something like this. ;)