No Service after Unlocking iPhone 3G
i bought my iphone through ebay last month. it's from the US and i'm in malaysia. the phone is in contract with at&t, so i had to jailbreak and unlock it, which was what i did as soon as i received the phone. it worked perfectly as instructed on the website. 2 weeks ago, itunes asked me to upgrade my iphone software, so i clicked install. after it finishes, the phone went back to being locked. i tried jailbreaking it again, it worked. but unlocking it never worked. i've tried like around 20 times. the network keeps on searching for a long time before it displays no service.
i jailbreak using pwnagetool, and i have tried selecting the activate phone and deselected it. activating it jailbreaks it. deselecting it doesn't. help me please! i need a working phone!