Using your iPhone to connect to the internet on your laptop is useful.  In the US, AT&T does not provide this service so check how its going to affect your data plan and if it affect any warranties etc.. They say this service is coming in the near future, but of course there will be a charge. Until then if you want to tether iPhone 3G here is some guidance.

To tether iPhone 3G, you will need to download and install a carrier update file. There are multiple sites that you can find one of these for your iPhone 3G. Make sure you have the one for your country and carrier. Once the file is installed all you need to do is go to Settings -->General -- >Network and turn on Internet Tethering and select USB or Bluetooth. Now you’re all ready to connect your computer to the internet.

With this method you don’t need to jailbreak your iPhone 3GS to tether iPhone to laptop. You might use a lot of bandwidth and that might be an issue with your carrier. Check your data plan before you attempt to tether iPhone. Do it at your own risk, since you might get slapped on with some additional fees later.

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