Ultimate Guide to Unlock iPhone 3G 2.2 (Firmware 2.2) with Yellowsn0w

Any Sim..Anywhere..Use your iPhone 3G..!!

iPhone dev team finally released one of most awaited tool, yellowsn0w. Yellowsn0w is first software unlock tool for iPhone 3G firmware 2.2. The wait for release of Yellowsn0w was quite long one as dev team failed to release on New Year’s Eve but the work done by dev-team is really appreciative.
iPhone Dev team managed to crack latest iPhone 3G baseband 02.28.00 and its surprising that yellowsn0w will now only work with iPhone 3G Firmware 2.2 Baseband 02.28.00 which is contradictory to their prior Message .Their is no news from Dev-Team about making Yellowsn0w to work with Baseband 02.11.07. Many users are facing issue while Unlocking iPhone 3G 2.2 with Yellowsn0w.
Here are answers to all your iPhone 3G Unlocking related questions. We are representing this as a Guide to Unlock iPhone 3G.

Ultimate Guide To Unlock iPhone 3G Firmware 2.2

1. How to Install Yellowsn0w from Cydia
A. Launch Cydia
B. You should see Two Options Packages and Source.
C. Go to Packages -> Edit -> Add & Enter http://apt9.yellowsn0w.com/ URL as a repository URL.
D. Now Go back to Your Cydia Sources menu and you should see the yellowsn0w package!

Screenshots of Yellowsn0w

2. How to Unlock iPhone 3G Firmware 2.2 with Baseband 02.11.07
A. Download latest iPhone 3G Firmware 2.2 from Apple.
B. Use iTunes to Upgrade Your iPhone 3G 2.1 to 2.2.
C. Download QuickPWN 2.2 and Jailbreak your iPhone 3G 2.2 to Install Cydia and Installer.
D. Follow How to Install Yellowsn0w from Cydia Instructions.
E. Run Yellowsn0w
F. Turn off the iPhone and install your third party SIM.
G. Turn on the phone. Wait until your iPhone 3G carrier pops up. If it doesn’t, take the SIM out and reinstall it.

3. How to Unlock iPhone 3G Firmware 2.2 with Baseband 02.28.0
A. You need to have Jailbroken iPhone 3G Firmware 2.2
B. Download QuickPWN 2.2 and Jailbreak your iPhone 3G 2.2 to Install Cydia and Installer.
C. After Jailbreaking iPhone 3G Firmware 2.2 follow Instruction of How to Install Yellowsn0w from Cydia
D. Run Yellowsn0w
E. Turn off the iPhone and install your third party SIM.
F. Turn on the phone. Wait until your iPhone 3G carrier pops up. If it doesn’t, take the SIM out and reinstall it.

4. How to Unlock iPhone 3G Firmware 2.1 with Baseband 02.27
Yellowsn0w won’t work on 2.1 because it has baseband 02.27. DevTeam has restricted it to 02.28 baseband so you must jailbreak and update toiPhone 3G firmware 2.2 in order to use this unlock.

5. How to Upgrade iPhone 3G 2.2 Baseband 02.11.07 to iPhone 3G 2.2 Baseband 02.28.0
Well there is no way which lets you to upgrade only baseband of your 3G iPhone. You need to restore your iPhone 3G Firmware 2.2 to Firmware 2.1 and then again upgrade your iPhone 3G to Firmware 2.2 using iTunes. please keep in mind while upgrading/downgrading iPhone Firmware you will lose all your apps, settings etc.

Important Note:
1. Yellowsn0w is still in beta so use it at your own risk
2. Yellowsn0w is for non commercial use
3. Yellowsn0w many or many not work for you.
We will be updating this guide as an when we get any other information. If you find any issue with this guide then feel free to comment here.

Source: Internet