Jailbreaking and unlocking the iPhone 3G S using redsn0w and ultrasn0w/purplesn0w
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Step 4.
Let's unlock the iPhone now. We will be using ultrasn0w. If you want to use purplesn0w, then skip ahead to Step 7. Launch Cydia. You'll be greeted with this message. Cydia will then close. Launch Cydia again. You'll be greeted with this message. Make your choice. You can always change it later. Note: Ignore the AT&T logos in these screen shots if you have an unactivated iPhone. This will still work.
I recommend performing these upgrades. Once they have been installed, Cydia will close again. Launch Cydia one last time. Press the Manage button, then press Sources.
Press Edit, then press Add.
Enter repo666.ultrasn0w.com then press the Add Source button. The source will be checked and added. Press Return to Cydia.
Press Done. Then press the source name.
Press ultrasn0w. Press Install.
Press Confirm. When it has finished installing press Return to Cydia.
Press the Home button to return to the SpringBoard. Launch Settings. Press General, then press Network. Make sure Enable 3G is set to OFF. Go back to Settings, and turn on Airplane Mode. Turn off the iPhone.
Step 5.
Switch out your SIM cards.
Step 6.
Turn on the iPhone. It may say Searching... for up to a minute and a half until it finds your new carrier.
Note: If it says Off (in gray) next to Wi-Fi, it did for me, do this to fix it: from this menu press General, then press Reset, then Reset Network Settings. The press Reset Network Settings at the confirmation screen. You'll get the spinning wheel on the SpringBoard for a minute and the iPhone will reboot. All should be well.
The About page will display that you are now unlocked and on 3.0 firmware and on the latest modem firmware. Note: I erase my iPhone's personal hardware specs from these screens. Yours will have values there.
For more information on ultrasn0w, and any perceived issues, or conflicts, read this post by the iPhone Dev Team.
Should you have issues with Push notifications or ultrasn0w dropping your cellular signal, read this post by ranova over at BigBoss.org
Step 7.
Let's unlock with purplesn0w next. First, launch Settings, press General, press Network, and make sure that the Enable 3G switch is set to OFF.
Launch Cydia. Press the Manage button, then press Sources. Press Edit, then Add. Enter the URL http://apt.geohot.com, then press Add Source. Press Done and the source will be added. Press the source name in the list to go into its folder.
Press com.geohot.purplesn0w, then press Install.
When it has finished installing press the Return to Cydia button.
Turn off the iPhone and switch out your SIM cards.
Turn on the iPhone. It will say Searching... for a few seconds, and then should locate your new carrier.
Here it is, proof of the 3G S running in the U.S.A. on T-Mobile.
