If you enter the wrong PIN more times than the maximum number of attempts allowed, the card will become “PUK-locked.”
You need a Pin Unlock Key (PUK) code to restore access to
HTC Desire 520. Contact your mobile operator for this code.
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On the Phone dialer screen, enter the PUK code, and then tap
Next.
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Enter the new PIN you want to use, and then tap
Next.
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Enter the new PIN again, and then tap
OK.