download link: http://edownloadok.com/Madge340/iPhone
YouTube - Unlock iPhone 4 & 3Gs IOS 4.1_4.2 BaseBand 5.14.02 REDSN0W
Oilra1n is a software tool which can jailbreak and unlock all iPhones (iPhone (Edge), iPhone 4 iPhone 3G and iPhone 3GS) and iPod touches (iPod touch 4G 2G and 3G MC NON-MC) running on the firmware version 4.1
The following step by step guide will help you jailbreak your device on iOS 4.1
Step 1: Download and Install MSVB runtime components and dotNETfx3.5
Step 2: You will need to be on the official iOS 4.1
Step 3: Download Oilra1n.
Step 4: Click on "make it ra1n"