This iPhone 4 is unlocked by Gevey SIM which was announced few days ago.
Gevey SIM for iPhone 4 basically works by forcing the activation of the baseband using the emergency dialer, and it is also said to be vulnerable up to iOS 4.3.
We totally advice and recommend you wait for a legal iPhone 4 unlock from the iPhone Dev Team which will be possible soon thanks to the 40-bit NCK exploit for iPhone 4.
Here's a video in action:
I already had tested Gevey sim and it works great in my iPhone 4, actually through word of mouth I recommend this with my friends. I even buy it in a cheaper price at www.unlockaniphone.org
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