Jailbreak, Unlock iOS 4 iPhone 3G, 3GS

Apart from existing methods of Jailbreaking iOS4, Sn0wbreeze can quickly  jailbreak iOS 4 on iPhone 3G, iPhone 3GS (with old iBoot) and iPod Touch 2G. In order to install UltraSn0w unlock on iPhone 3G, you need to first jailbreak your iPhone.
Pre-requisites:

• iPhone 3g, 3GS 3.0/3.0.1 Redsn0w
• iPhone 3g, 3GS 3.0/3.0.1/3.1/3.1.2/ iOS 4 GM Pwned
• iPhone 3g, 3GS 3.1.3 Spirit : (not yet)
  

Downloads

• Sn0wbreeze V 1.6
• iPhone 3GS iOS 4 Final Firmware Download Here
• iTunes 9.2 Download Here

Jailbreak iPhone 3g, 3gs, iPod touch on iOS4
Step 1. Launch Sn0wbreeze as administrator and connect  your iPhone via USB.
Step 2. Click on next arrow and choose your preferred mode:

• Simple Mode - Step by step instructions (as below) and automatically detects your correct firmware and adds the unlock and activation and jailbreak with Cydia automatically to your custom firmware.
• Expert Mode – You have the power to adjust the settings on the various different additions to the custom firmware – if you click through and do not change anything in expert mode it will make the same.

Step 3. Lets select firmware. click “Browse” and locate it.
Step 4. Lets go through steps ne by one. Click “General” and advanced. At this point, if you chose to Jailbreak iPhone, the sn0w  asks us if you wish to activate your iPhone.
If you are using an Official service provider (i.e. AT&T or any other for worldwide users) you do not need to Unlock Baseband, select NO. If You are using an Unofficial service provider then Select YES
Step 5. Next you chose to install Cydia or Rock or both. Cydia is enough.
Step 6. It ’s time to choose the packages to be included in your firmware. We can choose between:

• Repository pre-added
• Add. Deb that you have on your computer.

We are almost done and ready to  “Build IPSW”. Just sit back and relax while custom ipsw is built.
Step 7. Now put your phone in DFU/Recovery mode

iPhone in recovery mode :

1. Turn the device completely off and disconnect it from cable/dock.
2. Hold down the home button.
3. While holding down the home button connect to a computer with a cable (easiest) or dock.
4. Keep holding down the home button until you see a connect-to-iTunes screen You are now in recovery mode.

Step 9. Fire iTunes and hold Shift  click on “Restore” button in iTunes and Browse the firmware you just created in step 6. Chill out as you wait. Now you have jailbroken iPhone/ iPod touch on iOS4. ext we will unlock it.
If you are  official carrier or own iPod Touch, you are done.
Unlock iPhone 3g, 3gs Baseband 04.26.08, 05.11.07, 05.12.01 and 5.13.04 With Ultrasn0w
Step 1. Open Cydia and add source http://repo666.ultrasn0w.com
Step 2. Search for ultrasn0wand install it and reboot with ANY SIM, your iPHONE IS UNLOCKED.
Other Jailbreaking guides:

• Jailbreak iOS 4.0 on iPhone 3G, iPod Touch [Windows, Mac]
• Jailbreak iOS 4 iPhone 3GS with Spirit
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  HowTo Jailbreak iPhone 3G 3GS 3.1.3 [Spirit]