Learn how to use the Mobile Device Unlock code of the HTC One M8 for Windows.
Contact Customer Care to request the Mobile Device Unlock code for your phone.
Turn on the phone with the non-T-Mobile SIM card. The device displays 'Please input unlock code.'
Enter the unlock code. If successful, the device displays 'Phone is unlocked.'
Stop if you receive an error message. The device may lock permanently if the incorrect code is entered multiple times.
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