Great news for the ones that want to unlock iPhone 3G/3Gs/3.1.3, the Iphoneland hackers released updated software to unlock iPhone 3G/3Gs/3.1.3 that will help all users to unlock iPhone 3G/3Gs/3.1.3 faster an easier.
Iphoneland posted a new version of purplera1n so that the program now supports all Windows versions (XP, Vista and 7) in all languages and of course Mac. The new version also saves you Step 1 of my instructions! And for all the beginners you can found detailed guidelines (though in English) very well explained!

Visit www.unlock-iphone.org for more info

(Step 1: Search for the file “iTunesMobileDevice.dll” (which is with me in c: \ bin \ Program Files \ Common Files \ Apple \ Mobile Device Support \) and create the folder C: \ Program Files \ Common Files \ Apple \ Mobile Device Support \ bin \ (if not already present), where now the copy in iTunesMobileDevice.dll.)

Step 2 Download iphonia software from our website

Step 3: Download iTunes 8.2 and launch it

Step 4: Start Iphonia (IPhone is in Recoery fashion, purplera1n needs to run again and reboot your iPhone)

Step 5: iPhone unlock and Freeze runtime. (Start the Cydia download)

Have a lot of fun with your unlocked and jailbreak iPhone 3G. Thanks also to Digital killers for the hacks.