iPhone 3G

It's not the groundbreaking, industry-changing event that the original iPhone was. But the iPhone 3G is a worthy upgrade to Apple's smartphone, and fixes a few flaws that kept many people from buying the first version.
The addition of fast 3G wireless data, GPS and a more flexible, extensible operating system mean the iPhone is now entirely competitive with almost every other smartphone on the market. And its new, lower purchase price will remove the final obstacle to purchase for many people. In short, this phone is about to become very, very popular, as it deserves to be.
Physically, the phone is nearly identical to the previous generation. It measures 2.4 x 4.5 x 0.4 inches, and weighs 4.8 ounces, making it just 0.1 inch wider and 0.3 ounces lighter than the iPhone 1.0. It feels substantially thinner, thanks to tapered edges, which make it sit more comfortably in the hand. Instead of a silver aluminum back, the new iPhone has a plastic backing, available in either glossy black or shiny, iMac white. The screen and 2-megapixel camera are identical to those in the older iPhone, but the external speakers are much improved. Call quality was noticeably clearer in our initial tests.

Fast Data and GPS
One of the biggest shortcomings of the iPhone's first-generation model was its reliance on AT&T's slow EDGE data network. The new 3G data support means that the iPhone can download data 2-3 times faster than the old model. Of course, it still has WiFi support, and based on early reviews, you may want to use WiFi whenever it's possible, because 3G usage will drain the iPhone's batteries quickly.
It's probably not a must-have feature for most users, but the addition of a GPS receiver is a welcome enhancement. The iPhone OS can now use a combination of GPS data and triangulation from WiFi hotspots and cell-tower locations to establish its location. This feature has worked well in our testing so far, and we expect its usefulness to expand as an increasing number of applications start to take advantage of it.

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Specs: Apple iPhone 3G
3G wireless data
WiFi
Bluetooth
GPS
2-megapixel camera
iPhone 2.0 OS
3.5-inch multi-touch LCD
320 x 480 pixel display