Today, about a month after I arrived in Malaysia, I am finally able to use my iPhone (which was locked to AT&T) with a DiGi sim card. Woohooo!
Yesterday, I updated the iPhone firmware to the latest firmware, the iOS 4. I did that because I learned that there was a software to jailbreak that version of the firmware as well as a software to unlock the phone on ALL basebands.
I lost the previous unlock because my iPhone crashed and the only way to get it going again was to restore it to default factory setting. The iPhone hackers did not want to release the unlock software until after the release of the iPhone 4. Well, the iPhone 4 has been released, and after patiently waiting for the jailbreak and unlock softwares, my patience has been rewarded.
The instructions for the jailbreak and unlock were clear and easy to follow. Since this was not the first time I had jailbroken and unlocked my iPhone, the process was a breeze.
Jailbreak with Redsn0w.
Unlock with Ultrasn0w.