These are essentially three different scales of devices. To use the American measures: inch devices, foot devices, and yard devices - and each has a particular range of appropriate functions... Inch devices, like cell phones, pagers, and PDAs, are for a single person's use, and are unique for their ability to help a person deliver important information from anywhere. Their screens are not for reading, but for eyeballing or copying a fact or figure that will most likely be used on that very device. Stock quotes, weather forecasts, or restaurant addresses are appropriate data points for a communications device on which you might make a trade, a date, or a business meeting. Yes, avid sports fans may want to check an important score (and then call their bookies) but do they want to watch a tiny, inscrutable image of a goal being kicked? No. They'll want to get home to see the event on their foot devices.
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