Symbian phones were also based on WebKit, however it wasn't nearly as usable due to many factors, mostly because it emulated mouse pointer (and you controlled it via the joystick) and didn't provide the pinch-to-zoom fluidity of the iPhone Safari. Also iPhone supported most of the major fonts used on the web, had font smoothing, etc. I've used both Symbian WebKit and Safari on first iPhone, and they aren't even close even though they're based on the same underlying browser tech.