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Internet Tethering over USB Setup on iPhone 3G and Windows Vista Computer

Internet Tethering Introduction
Internet Tethering Requirements
Internet Tethering over USB Overview
Internet Tethering over USB Setup on iPhone 3G
Internet Tethering over USB Setup on Windows Vista Computer


The Dock Connector to USB Cable that came with an iPhone 3G package is used to sync the iPhone 3G with iTunes and to charge the iPhone's battery. Besides that, the Dock Connector to USB Cable can be used to tether Windows/Mac computer to Internet via iPhone 3G. iPhone 3G or iPhone 3GS with OS 3.0 or later can do this officially, no need to hack or jailbreak as long as your 3G operator allows this service over their network with or without additional service fee. This Internet Tethering over USB is a quick and simple solution to connect a computer to Internet. However, while other cell phones work as a modem when tethering a computer to Internet, iPhone 3G or iPhone 3GS functions as an Ethernet network adapter instead.

A computer (named RIZ-PC) uses the Dock Connector to USB Cable to connect to Internet via iPhone 3G as its Ethernet adapter ( The iPhone 3G then connects over 3G cellular network to Internet gateway/DHCP server ( at the 3G operator site.

Picture. A notebook uses Internet Tethering over USB of iPhone 3G to connect to Internet.

For the presentation on this article, I used an iPhone 3G 16 GB with OS 3.0.1 and a Sony VAIO Z series notebook running Windows Vista Business 64-bit Edition with Service Pack 2 (SP2). However, as of this writing iPhone OS 3.1.2 has just been released and Internet Tethering works the same way on it. 

iPhone Software Version 3.0.1 in iTunes > DEVICES > iPhone > Summary

Picture. Checking iPhone OS version from iTunes.

The following are the step-by-step description of how I used Internet Tethering over USB feature of iPhone 3G. This step-by-step procedure is also applicable to Windows 7.

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