Originally Posted by DrJPB
Here's what i did to solve my settings problem, and how i successfully unlocked my 3G 3.1.3:-
First restore 3.1.3 from iTunes (shift+restore), and select already downloaded 3.1.3 from apple. Next comes jailbreak, use redsn0w 0.94 to jailbreak but i used v3.1.2 to jailbreak (same technique advised many times before). After jailbreak, just use the above posted application or use ultrasn0w repo to install the unlock from ultrasn0w.
Please do try it again and let us all know your results.
The phone is 3Gs not 3G
3G is already supported by RedSn0w 9.5b5-3