I got quite curious about this, so I obeyed the Mongoose's Motto. (RikkiTikkiTavi, how you would love google). Voila! http://www.vcalc.net/Keyboard.htm
Several competing theories, but it seems the phone co's did usability research and the calc folks didn't, and all else being equal (two keyboard type devices), people are quicker at the 'phone' version with 1-2-3 on top. Of course, anyone who touch-types is quicker with the numpad.
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Several competing theories, but it seems the phone co's did usability research and the calc folks didn't, and all else being equal (two keyboard type devices), people are quicker at the 'phone' version with 1-2-3 on top. Of course, anyone who touch-types is quicker with the numpad.