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This is step-by-step instructions on how to jailbreak and unlock your iPhone 3G on iOS 4.2.1 firmware using RedSn0w 0.9.6b5 for Windows.

For iPhone 3GS use this tutorial.

IMPORTANT FOR UNLOCKERS
During this process you can update your baseband to the 06.15 version. If you are on 05.14 or 05.15 or higher you will need to do this to unlock. You do not need to do this for jailbreak only. Please read the following very carefully before deciding whether to do this.

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These are instructions on how to jailbreak and unlock your iPhone 3GS on iOS 4.1 using PwnageTool 4.1.3 for Mac OS X. This tutorial will explain how to upgrade your baseband if needed for an unlock.

For iPhone 3G use this tutorial.

There is no unthethered jailbreak for new iPhone 3GS bootroms and iOS 4.2.1 yet, so you should stay at iOS 4.1.

Important: iPhone3GS users with old bootroms who want to go to 4.2.1 and unlock should not use this PwnageTool! Update to stock 4.2.1 first, then use new redsn0w to update your baseband.

Step One
Make a folder called “Pwnage” on the desktop. Download a couple of things:

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These are instructions on how to jailbreak and unlock your iPhone 3G on iOS 4.2.1 using PwnageTool 4.1.3 for Mac OS X. This tutorial will explain how to upgrade your baseband if needed for an unlock.

Step One
Make a folder called “Pwnage” on the desktop. Download a couple of things:

• PwnageTool 4.1.3 from here

You will also need the 4.2.1 iPhone firmware.

• iPhone 3G iOS 4.2.1: iPhone1,2_4.2.1_8C148_Restore.ipsw

If you are on the 05.14 or 05.15 baseband you will also need the iPad 3.2.2 firmware. You can find out your baseband version in Settings -> General -> About -> Modem Firmware.

• iPad iOS 3.2.2: iPad1,1_3.2.2_7B500_Restore.ipsw

When downloading the IPSW file, it is best to download it with Firefox since Safari often auto extracts it!

Step Two
Double click to mount PwnageTool then drag the PwnageTool icon into the Pwnage folder.

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Today DevTeam released an ultrasn0w update that fixes a bug for those who run it on firmware 3.1 and 3.1.2 with the 04.26 baseband. This bug was about a missing carrier name in the upper left-hand corner of your home screen. The update is avaliable in Cydia (repository http://repo666.ultrasn0w.com).

We remind you, that ultrasn0w 0.92 doesn’t work with baseband05.11.07!

[Update]: if your 3G or EDGE connection isn’t working try manually clearing and re-entering your APN.

[Update 2]: Carrier logo fix confirmed (by order of tweet):
USA, Thailand, Austria, Trinidad, Germany, China, Kuwait, Serbia, Poland, France, Nigeria, Egypt, Pakistan, Ireland, UK, Turkey, Sweden, Switzerland, Malaysia, Hungary,The Netherlands, Bahamas, Jamaica, India,
Israel, Belgium, Canada, Portugal, Denmark, Costa Rica, Italy, Chile, Argentina, Brazil, Japan, Mexico, Venezuela, UAE.

MuscleNerd, the member of Dev-Team, created a nice post on twitter saying that ultrasn0w, the program that lets you unlock the iPhone 3G/3GS, functions just great with firmware 3.1.2. However you need to preserve baseband 04.26.08.

So the Dev-Team is working on new version of PwnageTool. Here is a screenshot that shows the new firmware and the old baseband: