From the AT&T website:
Internet in Your Pocket
iPhone uses fast 3G and Wi-Fi wireless connections to deliver rich HTML email, Maps with GPS, and Safari-the most advanced web browser on a portable device. iPhone automatically syncs bookmarks from your PC or Mac and has Google and Yahoo! search built in. Since iPhone multitasks, you can even make a phone call while emailing a photo or surfing the web over a Wi-Fi or 3G connection
http://www.wireless.att.com/cell-phone-service/specials/iPhone.jsp
Internet in Your Pocket
iPhone uses fast 3G and Wi-Fi wireless connections to deliver rich HTML email, Maps with GPS, and Safari-the most advanced web browser on a portable device. iPhone automatically syncs bookmarks from your PC or Mac and has Google and Yahoo! search built in. Since iPhone multitasks, you can even make a phone call while emailing a photo or surfing the web over a Wi-Fi or 3G connection
http://www.wireless.att.com/cell-phone-service/specials/iPhone.jsp