IIm on my 3rd Iphone. To be honest it fails quite a bit (at least once a month), but then its bbecause i never reset it, turn it off or quit applications I have not used in two weeks.
but as a concept, I dont think it failed. Look how many Copycat Smartphones and tablets are out their!
It does help that they released the user interface on the touch, long before the 1st Iphone was released, so it had ironed out some of the major bugs by then!
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