There are currently 2 different iPhone models. The iPhone 3G which was released in July 2008 followed by the 3GS a year later in 2009.
In addition to the feature set the iPhone 3G has, the 3GS also has:
- Faster performance
- Takes video which can be edited, e-mailed or posted on to YouTube or synchronised back to your PC via iTunes
- a camera is 3 megapixel and does autofocus (up from the 3G 2 megapixel)
- a built in Compass
Each phone comes in 2 different models. The 3G has both 8gig and 16gig models, where as the 3GS comes in 16gig and 32gig.
Should you upgrade from a 3G to a 3GS? Unless you absolutely need faster performance or video capability, probably not. Although they are different, both the 3G and the 3GS do run the same version of the Operating System which makes it easier to manage.
The Voice Control functionality on the 3GS is kind of cool though, however I found it’s accuracy to be quite dubious. How does Alex ever sound like Helpdesk?!
However with the upcoming release of OS4, some of the newer features such as multi tasking may only be available on the 3GS and not the 3G model.