Seriously, the original iPhone had little going for it technically. No GPS, poor data bandwidth, no apps, and minimal ability to make phone calls. (It took the combined efforts of Apple and AT&T a couple generations before you could reliably place a call.)
But it had a touch screen that felt nice, and you could watch videos and play music! The web browser actually performed well despite the low bandwidth. It could zoom. And Steve Jobs marketed it well, whereas Steve Ballmer was terrible at marketing.
IMO the iPhone was considerably worse for business use than Windows Mobile, and neither one held a candle to the BlackBerry. But it didn’t matter.