Why not use an ipad as a cellphone via skype? A watch? A hologram watch?!I answered what I carry 100% of the time. However, 98% of the time, I have a book bag with me that contains many of the other items (including cell) and many other items (and may contain notebook computer, but that is only only about 30% of the time as I like to keep it as light as 'possible'). I am slightly less dependent on cell phones than younger folks (actually, I like being inaccessible to all communication at times).