How to internet tether your iPhone 3GS on on version 3.1.2

Warning: AT&T considers internet tethering a violation of the agreement, but since you more than likely have already jailbreaked or unlocked your phone, you may be aware of the consequences. The general rule of thumb (untested) that I have found is internet usage less than 5 GB. I am not responsible for your data usage and this is not a guaranty that AT&T won't discover your tethering and charge you accordingly.

Now, how I tethered and jailbroke my iPhone 3GS. You will need to refer to these two resources:

1. blackra1n to be downloaded to your computer.
2. Peaceful Insanity File to be downloaded by your iPhone.

Jailbreaking your iPhone in version 3.1.2

1. Download blackra1n to your PC.
2. Plug in iPhone.
3. Run blackra1n program and click "Let it Rain."
4. Enjoy your jailbroken iPhone.

Below is a youtube video of a guy thoroughly covering the process and answering some of the commonly asked questions. If you have never done this before or wish to have more information in addition to this post, please watch the video. He does it on an iPod Touch, but it will work for any type of iPhone or iPod Touch.



Step-by-Step Guide for internet tethering:

1. Open blackra1n and download Cydia. The iPhone should respring (aka soft reboot) after installation.
   
2. Open blackra1n and download sn0w app. Run sn0w to unlock iPhone. Note: You cannot tether your iPhone if you do not run this app. Thanks for testing that Brian. Don't worry, you can always return your iPhone back to original Apple specifications through iTunes.
3. Once unlocked, go to the the website http://m.peacefulinsanity.com/Tether.mobileconfig from your iPhone. Your iPhone screen should look like this:
4. Click Install and the file will add a profile to your phone that will open up the tethering functionality. Once it is finished installing, reboot your iPhone.
5. Once your iPhone is rebooted go to Settings-> Network->Internet Tethering. Click On.
6. Your pc may have the ability to connect via bluetooth, so you have the choice of establishing the internet connection by plugging it in with a USB cable or wireless with a bluetooth signal. I personally prefer the USB because it makes sure the phone always has power.

Notes:

• You must have the latest version of iTunes installed. This is because there are special drivers and files that come with it that recognize the iPhone as a modem and it will not work if iTunes is not installed. Thanks Brian for the info on that.
• If you have a 3GS and the phone dies, you will have to restore it. Sync your phone regularly to avoid losing valuable data or keep it charged. Nevertheless, it's easy to restore an iPhone, so this may not bother you.
• There are other profiles you can download, but this is the only one so far that I am aware of that works for my iPhone. If the profile from Peaceful Insanity does not work, search the internet for the others.
• 3G speeds are fast, but wifi is almost always faster and doesn't increase your data usage. If you can use wifi, default to it. Tethering should be used as a supplement when other options aren't available.