I dont think iPhone will be a huge success to be honest. Yes, it looks and feels amazing im sure, but when looking at technical specifictations, its not going to be up-to-date by the time it gets released, especially in the pro-mobile-user community.. Here is why:
* No Office document capabilities
* Unknown Exchange support
* No 3G equals no HSDPA support (got WiFi though, but still)
* The biggest minus of all, a lock OS, meaning technically not a smartphone. No 3rd party applications can be installed. Take Symbian or Windows Mobile that have loads of freware available.
* Large buildt-in storage, butno memorycard support
* No GPS, which after all seems to be a more and more desired feature (several phones got it already, and many more comming this year)
That said, iPhone does have several nice features, but overall, i think it will turn out to be a overpriced product which will suit the ones after visual satisfaction, but will leave the ones who use their phone for much more then calling\texting\music (read: office) much to be desired.
FYI, Apple has stated that a 3G version of the iPhone will
be released; their isn't enough HSDPA coverage in North America right now to warrant it. As for no memory card support, I'm not sure why you'd want one with up to 8GB of storage already. AFAIK you will be able to sync your contacts and whatnot with your computer, so transferring necessary data to and from the iPhone won't be a problem. It's too bad the OS is so tightly locked down, but I'm sure someone will hack it eventually. Lack of GPS and office document support aren't killer, either – the iPhone isn't being marketed to the Crackberry-toting business crowd. The iPod name and gorgeous design alone are almost enough to guarantee the iPhone's success. People have been speculating about an iPod phone for years, and the announcement of the iPhone has only served to further increase the already insane buzz. The iPod isn't the best or most feature-rich MP3 player out there, and yet it controls more than 70% of the market. By doing a few things very well and making the iPod into a desirable status symbol through its unique design, Apple has made the iPod phenomenally successful. Barring some catastrophe, it seems a foregone conclusion that they'll repeat this success with the iPhone.