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Device Unlock error: "Your data cannot be validated by the system."

I am trying to unlock my old iPhone, but I don't have an account with AT&T anymore. I bought the iPhone in December 2013 on a 2 year contract, but than I cancelled my personal contract (and paid the remainder) in June 2014 when I switched to AT&T business account through my work. I didn't have to un

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 • Apple

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How do I unlock an AT&T phone without account?

I purchased an AT&T GoPhone from a retailer. The device just arrived and I want to unlock my device. Can I do this online?

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 • Other Phones & Devices

325.2K

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