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syings wrote:

Hello, I sent my iphone unlocking request last friday and get an email on Sat saying I am eligible and ready to be unlocked. However, It seems my phone still locked until today. I don't know what's going on. Would you please advise me how to move forward.

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Keep trying in iTunes.  A few things have to happen after they send you an email that you are eligible.  First, AT&T has to request the unlock from Apple.  Second, Apple has to update their iTunes servers.  Both can take a little time.