iPhone 3GS vs Nokia N97: Entering text – Watch in HD on YouTube.
At 4:44, text input accuracy is demonstrated.
The N97 has a physical, slide-out QWERTY keyboard, but because the phone does not have an auto-correct function, there were several errors in the text entry.
No mistakes were present in the final text entry on the iPhone, which only has a touchscreen keyboard, but has the added advantage of a built-in auto-correct feature.