- 5. You'll then find the "yellowsn0w" application for download. Tap on it and then tap "Install". Then tap "Confirm" to start download.
- 6. Once the installation is complete, tap "Return to Cydia". And then press "Home" Button to go back to the home screen.
- 7. Press the “Sleep” button and hold it off until you see the “slide to power off” message. Then slide to switch off the iPhone.
- 8. Wait until your iPhone completely shutdown. Now make sure you have inserted your desired SIM card in iPhone and turn on your iPhone.
- 9. Once your iPhone boots up and you will see the “Slide to Unlock” screen, wait for around 15 seconds (may be more) and your iPhone will pick up the signal of the carrier.
- 10. If there is no signal pop up, try to pull out the SIM card and re-insert it. Wait for another 15 seconds and see if this works.
- 11. Your iPhone 3G is unlocked and you should be able to make calls with your desired carrier now.
Important notes for Unlock with yellowsn0w
- After you go through all the steps and it still doesn't work, try to toggle "Fly Mode". You can go to "Settings" -> Turn ON Fly mode. Then switch it off again. This may help to pickup the carrier signal.
- Also, sometimes, a network reset will make the thing works. You can go to "Settings" -> "General" -> "Reset" -> "Reset Network Settings" to reset the settings. After that take out the SIM and re-insert it, see if this works.
- If you're in US and using T-mobile, you'll need to turn off "3G" in Settings to make the unlock work.
- No PIN support. Please disable any PIN on your SIM card in case you have any before using yellowsn0w.
How to Downgrade iPhone 2.2.1 to iPhone 2.2?
- 1. Download iPhone Firmware 2.2 and save it on your hard drive.
- Connect your iPhone to the computer and select your iPhone from the list of devices in iTunes. (put iPhone in DFU Mode if iTunes doesn't detect your iPhone)
- Hold down Shift and press the "Restore" button and select iPhone Firmware 2.2 file.
- Use QuickPwn to jailbreak your firmware 2.2 after restoring, then use yellowsn0w to unlock iPhone 3G 2.2.
How to Put iPhone in DFU (Device Firmware Upgrade) Mode?
- Connect your iPhone to your computer.
- Turn off your iPhone.
- Hold power and home together for 10 seconds (exactly).
- Release power but keep holding Home until the computer beeps as a USB device is recognized.
- Within a few seconds iTunes should detect your iPhone.