Unlocking iPhone 3G version 3.1.2 (7D11) with Firmware 5.11.07

In order to unlock your 3G, you must have Jailbroken your iPhone. GeoHot is the author of this software unlocker called Blacksn0w which can be downloaded from Cydia or Blackra1n.

Here are the steps :

• Launch Cydia.
• Navigate to Manage >> Sources >> Edit >> Add.
• Here Add the repo blackra1n.com and wait for Cydia to install the repo.
• Now go into the blackra1n repo or in search option search for blacksn0w and then click on install blacksn0w.
• Once completed, open the ‘blackra1n’ app on your iPhone’s home screen and install ’sn0w’.
• As simple as that