This tutorial is about unlocking iPhone 3GS on Firmware 3.1 via Ultrasn0w. Please note that this post is for those users who are on jailbroken firmware 3.0 or 3.0.1. Those of you who have upgraded to firmware 3.1 from iTunes but have saved your SHSH file to Cydia, you can still unlock/jailbreak but first you will have to downgrade your firmware back to 3.0 or 3.0.1. Click Here for details on downgrading your iPhone form firmware 3.1 to 3.0 we shared earlier.
To unlock your iPhone 3GS, first you will need to jailbreak it. Please follow our mentioned posts for jailbreaking iPhone 3GS on Windows and MAC.
Once you have jailbreaked Firmware 3.1 your iPhone 3GS, simply follow step wise instructions we posted here earlier (Follow from Step-4 onwards and you can successfully unlock your iPhone 3GS on Firmware 3.1 with Ultrasn0w).
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