Unlock the iPhone 3G by Hardware Hacking
Previously you could unlock the iPhone 3G by installing simple jailbreak hacking software. That is, until Apple released the 2.2 software update. You could also buy a sim card adapter to unlock the iPhone but it tends to drain the battery and be quite unreliable.
Now, however, a Vietnamese entrepreneur has developed an incredibly basic, yet tedious unlock which involves removing the bandpass chip (which contains the locking data) and using a Hex editor to remove the locking data from the chip. Read more details about the unlocking process.
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