The term smartphone is a popular word, basically, it refers to a device equipped phone (better with 3G), wifi, GPS, and other functions. It is a combination of a mobile phone, a PAD, etc. There are a few breeds of operation systems for so call “smartphone”
- Google Android OS is a open source, in fact, it is a modified linux kernel for mobile phones. Powering Samsung Galxy S (i9000) Samsung Galaxy Tab.
- Microsoft Mobile used by HTC (with its Touch Diamond), Motorola, Palm, and Samsung.
- Iphone OS, a pocket-size version of the Mac’s OS X, powering Iphone 3G, Iphone 4
- BlackBerry OS powers RIM’s BlackBerry smart phones, including the Curve, Pearl, and 8800, as well as the new Bold and Storm models.
- Nokia’s S60 3rd Edition powering N96
Apparently, Samsung Galaxy Tab is strong rival to iphone 3G. there is a nice concise comparison. 
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