Types of 3G

There are two main flavors of 3G: UMTS (Universal Mobile Telephone Service), which is being rolled out over existing GSM networks, and CDMA2000, which brings 3G speeds to CDMA networks; for a detailed explanation of terms, see the glossary. Both UMTS and CDMA2000--which has two high-speed offshoots, the data-only 1xEV-DO and the voice-plus-data 1xEV-DV--are already available in major cities with more expansion set for 2006. Speeds for both should be about DSL quality. We're also beginning to see discussions of 3.5G and 4G technologies such as HSDPA and WiMax, which should provide cable modem and gigabyte Ethernet speeds.

Of course, you'll need a 3G-capable phone to use one of the new high-speed networks. After a slow start, a wide assortment of 3G handsets is now available from the carriers. All the mobiles offer support for the new 3G networks, and they come in a variety of styles, from stylish and trendy--such as the Samsung SGH-Z540--to simple and functional, as in the Nokia 6233. For a complete list of phones, see the next page for all new 3G cell phone reviews. Laptop users also can take advantage of 3G networks for on-the-go broadband without a Wi-Fi network; all you need is a carrier-supplied PC Card.

Services and speeds 

	1G	2G	2.5G
Technology	AMPS	GSM CDMA iDen	GPRS 1xRTT EDGE
Speeds	n/a	Less than 20Kbps	30Kbps to 90Kbps
Features	Analog (voice only)	Voice; SMS; conference calls; caller ID; push to talk	MMS; images; Web browsing; short audio/video clips; games, applications, and ring tone downloads

	3G	3.5G	4G and beyond
Technology	UMTS 1xEV-DO	HSDPA (upgrade for UMTS) 1xEV-DV	WiMax*
Speeds	144Kbps to 2Mbps	384Kbps to 14.4Mbps	100Mbps to 1Gbps
Features	Full-motion video; streaming music; 3D gaming; faster Web browsing	On-demand video; videoconferencing	High-quality streaming video; high-quality videoconferencing; Voice-over-IP telephony

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