A thought that hasn't left my mind after my recent trial of the HTC Hero smart phone is a creeping suspicion that the days of the general purpose mobile phone are numbered. Up until now we have tended to carry one mobile device with us and used it for all occasions. It was fine for when at work, and on an evening out. It didn't matter what we where wearing or where we were, we would just have one phone. Now mobile devices are providing more and more functionality, and that functionality will differ in importance according to your situation. Is it logical any more to stick with one phone?