This is the official Apple iPhone 3G User Guide in English provided from the manufacturer. If you are looking for detailed technical specifications, please see our Specs page.
Apple iPhone 3G adds support of 3G HSDPA fast data and GPS. It has the same screen, camera, OS and memory (8 or 16GB) as the first one, and almost the same design but now will accept any 3.5mm headphones. It will run on the new software version which support third party application thanks to the official SDK.