See "G1 Takes on iPhone" on Wi-FiPlanet.com
See also an "Introduction to Mobile Devices" In the Quick Reference section of Webopedia.

New Samsung™ Cell Phones - Samsung Moment and Samsung Behold II Learn About them ™ Today!

G1 Takes on iPhone
Features in the G1 include built-in support for T-Mobile's 3G and EDGE networks, as well as Wi-Fi compatibility. On the strength of those features, T-Mobile, Google and the G1's manufacturer, HTC, are hoping their new entry can capture some buzz and market share from the current king of cool, Apple's iPhone.