I just tried it… and it works… rather more than less!

So for you guys who want to unlock your iPhone 3G, there are a few steps to follow to accomplish this:

- With iTunes, update (or restore, if you want to loose all your settings) your iPhone to the latest Firmware (2.2)

- Then, quit iTunes and download QuickPwn 2.2 from here

- Launch QuickPwn 2.2 and follow the onscreen instructions. This software will basically activate your iPhone, allow read/write access (jailbreak) and install Cydia, the equivalent of the Appstore for unofficial apps

- After your iPhone has been cracked by QuickPwn (it takes a few minutes), you will have new icons, including Cydia. Launch it.

- It will work some time and you will have to relaunch it. Also, do the updates if any are available.

- After that, in Cydia, go to “Sections” and select “Repositories” and add the “iClarified” and “iPhone-notes.de” repositories. It will take some time to refresh the sources.

- Go to “Manage”, tap “Edit” and “Add”. You will then enter the Dev-Team repository: http://apt9.yellowsn0w.com. It will again refresh.

- Go back to “Sections” and select “Tweaks”. Install “APN Editing”. This will allow you to manually edit the data connection settings for your operator.

- Finally, go to “Search” and type “yellowsn0w”. Install the unlock tool. NB: currently, the tool does not support SIM cards with PIN codes. So remove your PIN code (quit Cydia and change it in “Settings”/”Phone”/ “SIM PIN”) BEFORE installing Yellowsn0w!!

- Quit Cydia, go to “Settings” / “General” / “Network” / “Cellular Data Network” and put the correct settings for your GSM operator (Swisscom: APN=gprs.swisscom.ch, leave User and Password empty / Orange: APN=internet, leave User and Password empty / Sunrise: APN=internet, leave User and Password empty)

- Reboot your phone and that’s it!

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(Edit) Be very careful with your data traffic if you don’t have a specific data plan including some traffic!! If you want to avoid any traffic, leave the APN settings empty!!

(Edit 2) I couldn’t have 3G working correctly with the unlock tool. Data network is working, the 3G icon is visible, but I only get GPRS/EDGE speed… Hope they will fix the bug

(Edit 3) I seems to work better, if, once you’ve finished the steps above, you do a few more:

- Once you’ve rebooted the phone, reset the network settings (in Settings / General / Reset)

- Then turn on Airplane mode… wait 30 seconds… and turn it off again

- Take out your SIM…. wait 30 seconds… and put it back in

- wait 30 seconds…

With these steps, my phone was working correctly on Swisscom Network with an Orange SIM locked phone

(Edit 4) View the original blog post from the Dev Team to get more info!