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phone size = too small
laptop = too clumsy.
thats just one example of a tablet computer in its element. another is for students. i'd much rather have a device that doesnt take up screw all room in my back pack than a netbook. you need something with an ARM cpu that can suspend/resume instantly, weighs next to nothing, and is wide enough to be like a sheet of paper. hell, if used with a stylus it would be perfect.
whats hard about touching ya phone on something? like a spot that you touch onto the store owner's box.
and before ya say 'hacking through the i/o port' you're still sending data with RF so its no different. Just cant be eavesdropped.
But seriously. For this to be an advantage it would have to run as an application requiring no hardware changes, and would be subject to the same restrictions.
Like say - a limited range of frequencies (about 50Hz up to 18Khz to be conservative). Humans can hear all of that, and its even dangerous to be too loud at high frequencies.