You can now unlock iphone 3gs 4.3.3 baseband 05.16.02 firmware but this procedure involves some tricky and technical steps to unlock your iPhone to any carrier for free (without using gevey sim or factory unlocking)
This iPhone unlocking method works perfectly to unlock iphone 3gs 4.3.3 baseband 05.16.02 but with a bit tricky procedure which involves upgrading your iPhones baseband to 06.15.00
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To unlock iPhone 3gs 4.3.3 baseband 05.16.02 you need to update your iphone to iPad iOS 3.2.2 06.15.00 baseband.
Click here to upgrade your iPhone baseband to 06.15.00 with PwnageTool or to upgrade iPhone baseband to 06.15.00 using redsn0w.
Once your iphone 3gs 4.3.3 firmware 05.16.02 has upgraded to 06.15.00 baseband successfully you’re now good to start the steps to unlock iPhone 3gs 4.3.3 baseband 05.16.02
Instructions to unlock iPhone 3gs 4.3.3 baseband 05.16.02 can be found at following link:
Unlock iPhone 3G, 3GS Baseband 05.14.02, 05.15.04, 06.15.00 with Ultrasn0w 1.2.
This will let you successfully unlock iPhone 3gs 4.3.3 baseband 05.16.02