Unlocking iPhone 3Gs--the Vietnamese wayThe FedEx Kinko’s prepaid card is actually a SLE4442 smart card. There’s nothing secret about the SLE4442, it’s completely documented in the datasheet (PDF), and you can buy blank cards on the web. The card is openly readable, we’ll be able to look at the contents without any sort of malicious intrusion. It’s protected from writes by a three byte password, with a ‘three strikes you’re out’ policy that renders the card useless after three failed assword attempts.
The obstacle in question: the iPhone 3G. Since its launch, it has proven a much tougher nut to crack than the original iPhone. Without a viable software-based unlock solution, the only way to make the phone work with any GSM carrier has been the use of a proxy SIM. Put this piece of very thin circuitboard in the iPhone 3G atop the carrier's SIM, and you can make calls and text on a new network. Unfortunately, the recently released 2.2 software update, for now, has made the iPhone 3G impossible to unlock--unless you happen to be in Hanoi. Here, I met a man who takes the job quite seriously and gets it done the hard way, literally.
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