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3G technology gives iPhone fast access to
the Internet and email over cellular networks around the world. iPhone
3G also makes it possible to do more in more places: Surf the web,
download email, get directions, and watch video -- even while you are on
a call.

How it works
iPhone 3G uses a technology protocol called HSDPA (High-Speed Downlink
Packet Access) to download data fast over UMTS (Universal Mobile
Telecommunications System) networks. Email attachments and web pages
load twice as fast on 3G networks as on 2G EDGE networks. And since iPhone 3G seamlessly switches between EDGE, faster 3G, and even faster
Wi-Fi, you always get the best speeds possible.
Talk and browse at the same time
iPhone already gives you mobile multitasking. But 3G technology lets you
multitask in more places -- without connecting via Wi-Fi. Since 3G
networks enable simultaneous data and voice, you can talk on the phone
while surfing the web, checking email, or using Maps. All from your 3G
cellular network.
Go anywhere
iPhone 3G meets worldwide standards for cellular communications, so you
can make calls and surf the web from practically anywhere on the planet.
And if you are in an area without a 3G network, iPhone connects you via
GSM for calls and EDGE for data.
More wireless. Less space
iPhone 3G delivers UMTS, HSDPA, GSM, Wi-Fi, EDGE, GPS, and Bluetooth 2.0
+ EDR in one compact device -- using only two antennas. Clever iPhone
engineering integrates those antennas into a few unexpected places: the
metal ring around the camera, the audio jack, the metal screen bezel,
and the iPhone circuitry itself. And intelligent iPhone power management
technology gives you up to 5 hours of talk time over 3G networks. That is some of the best in the business.
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