If your cell phone is locked and you input the wrong PIN several times in succession, the phone will not allow further entries. To fix this, you need the phone's PUK, or PIN Unlocking Key, to gain access to your phone. As with PINs, these are originally assigned by the service provider, and are stored on the SIM card in your cell phone. If you enter the incorrect PUK code a particular number of times (this can vary by company), the SIM card itself will be rendered invalid and you must replace it.
PUK code
If you have exceeded the limit of PIN entries in an attempt to unlock your phone, you may see a PUK error, and be prompted to enter your PUK to be able to use the phone.
The PUK code is for your protection so that your phone can be protected from unlimited attempts to unlock it in the event it is lost or stolen. The PUK code is generally issued with your phone, and you should have received a written slip with the PUK on it. Alternatively, if you have purchased a new SIM card for the phone at some point, that paperwork should have the PUK for your SIM card.
Punch in the code to unlock your phone. Remember that the PUK is separate from and different than your PIN.
If you did not receive the PUK code or have lost it, you will need to retrieve the code from your service provider. If you have an online account, you may be able to access the PUK there. If not, consider signing up for one, as you may save time over calling the company directly, navigating their touchpad system and waiting for help. Be prepared to have information or documentation ready that you can recite to the operator, such as your date of birth, social security number and your account number. These requirements vary by company.
Once you have received your PUK, follow the online or operator instruction to key it in and unlock the phone.
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