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ale_campusano wrote:

Guys, I have sent an iphone 4 gift to Chile, but has been blocked and can only use a SIM AT & T, which no use to me and I can not unlock it, that's why I wonder if you as a community can help me my service provider asked me to unlock aT & T equipment, or who gave me a certificate which allows to bring the equipment into Chile. To fill it with another company.

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No way to unlock. Apple nor AT&T will do it.

 Best to have them send it back to you and send them an "UNLOCKED" Iphone you purchase directly from APPLE.