I was wondering if I can use my iPhone as a modem for my laptop?

I was with a friend this weekend and he plugged in his cell phone via a usb cable and was able to use AT&T's 3G network on his laptop while we were driving around.

Was woundering if this was possible on a 3G iPhone?

Thanks, from Las Vegas

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iphone week - 46 Original Version: 1.1.2
Upgraded to: 1.1.3 Upgraded to: 1.1.4
Upgraded to: 2.0.0 Upgraded to: 2.0.1
Upgraded to: 2.0.2 Using winpwn 2.5
Upgraded to: 2.1 Using iTunes 8
Upgraded to: 2.2 Using iTunes 8
Carrier: T-mobile
iPhone 3G = ATT Contract
Needed 3g SPEED......
Now running 3.1.2 firmware on my iPhone 3G
and is Jailbroken with Blackra1n. Cool.....

No need to double-post... http://www.hackint0sh.org/forum/f127/64782.htm

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iPhone 3GS / 3.1.2 JB (PwnageTool) / 04.26.08 carrier-locked, Carrier Logo Fixer / Cydia / 1000 posts on Hackint0sh

Installing Cydia programs on a phone that has no internet connection: read this.

Editing binary .plist, .strings, .nib and .xib files:
* on your computer: Windows tool / conversion website.
* on your iPhone: convert those files in a terminal with plutil (installed with Erica Utilities) or edit them with iFile (Cydia links).

thx jim, thread closed.

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iPhone 3GS factory unlocked (3.1.2; Blackra1n, Cydia, OpenSSH, custom 3.0 ipcc file (no sig), tethering hack by Dev team, 32 GB)
iPhone 3G (3.0.1; Redsn0w 0.8, Cydia, OpenSSH) 16 GB