Photo: Jonathan Li for CNBC.com. CNBC Contributor David Pogue shows off Apple's second-generation iPhone. Take a look at some of the new features, applications and design changes of the iPhone 3G.Related Links:Apple's New iPhoneFor iPhone, the 'New' Is RelativeYour Digital Life

Photo: Jonathan Li for CNBC.com. The new iPhone, pictured on the left, is slightly smaller and weighs a little less than the original one. The new phone now has a shiny black plastic back, unlike its predecessor's silver colored one.

Photo: Jonathan Li for CNBC.com. The back is slightly curved allowing for a better grip on the phone.

Photo: Jonathan Li for CNBC.com. The phone's new GPS technology allows users to get directions and search for nearby restaurants and shops.

Photo: Jonathan Li for CNBC.com. The basic calculator becomes a scientific calculator when the phone is rotated and held horizontally.

Photo: Jonathan Li for CNBC.com. Now that the new phone works on AT&T's 3G network, Apple says that Web browsing on the new model will be faster.

Photo: Jonathan Li for CNBC.com. Parents can now block and control what sites their children can visit on the phone's Web browser.

Photo: Jonathan Li for CNBC.com. The new phone will be cheaper than the original. The iPhone 3G will cost $200 for the 8-gigabyte model and $300 for the 16-gig model.

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