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A Personal Unblocking Code (PUC) or Personal Unblocking Key (PUK) is used in GSM mobile phones and some smartcards to unblock a blocked card.
Most mobile telephones offer the feature of personal identification number (PIN) protection. After switching on the phone, if the PIN security function is not switched off, the user is requested to enter a 4-8 digit PIN enabling the phone's non-emergency calling functions. If the wrong PIN is typed in more than three times, either the SIM card, the device or both become locked. They can be reverted to their original unlocked state by entering a PUC, provided by the service operator through verification. If the wrong PUC is entered ten times in a row, the device will become permanently blocked and unrecoverable, requiring a new SIM card. Cellular phone users are therefore advised by most providers to keep their PUC written down in a safe place separate from the device.
These directions are for an AT and T phone, but other than that, are the same for any carrier. A PUK (PIN Unlock Key) code is required to unlock SIM cards that have become locked following three successive incorrect PIN entries. If your SIM card becomes locked, you will need to get a PUK code from your phone carrier to unlock your SIM card. You can obtain your phone's PUK code from your carrier in one of these ways: Log in to Your account.online Use a Technical Support Chat Contact your carriers Customer Care Get Your Phone's PUK Code Online Go to the Phone/Device page. From the My Phone/Device screen, select the Unblock SIM Card link under the My Make & Model heading. The Unblock SIM screen will display your PUK code and will give you instructions for unblocking your SIM Card. Once you receive your PUK code, you will need to enter it into your phone to set a new PIN code. Note: If you enter the wrong PUK code 10 times in a row, your SIM card will be invalidated, and you will need to purchase a new SIM Card. The phone will display the following error: "PUK blocked call operator
As you put incorrect password three times or more depending on your mobile model, it will have ask for the PUK code.
To get the PUK code please call your service provider they are the one who can provide you the PUK code.They have a security check so as to make sure the mobile is yours.After you satify them they will provide you the PUK code.
Please enter the PUK code and you can type new password.
Provided you haven't used all 10 tries, please follow these instructions. You need to log onto your AT&T account online, find your phone, look to the right where it says unlock SIM card. Click on it and it will give you the correct PUK code. Be careful because you'll have to enter a new PUK code after correctly entering the code they provided. If you've already used all 10 tries, you'll need to purchase a new SIM card. I hope this helps.
PUK CODE: This is usually a problem associated with a LOCKED SIM CARD. This can sometimes happen when you enter your PIN incorrectly too many times. I would recommend going to a retail location of your service provider (ex. AT&T Store) and ask for a SIM CARD SWAP. This service is free for most providers. If you are charged for a SIM swap, tell the person helping you that SIM swaps do not cost any money and that they are free and that is what you were told over the phone.
OTHERWISE YOU CAN TRY THIS:
PHONE UNLOCK (Not related to PUK Lock):
There are websites online that provide unlocking services for a fee. If you google "phone unlock service" you will see many options.
There is also another way to go. You can call yout service provider (ex. ATT, T-Mobile) or the company that branded the phone (the company that the phone is locked to) and tell them that you would like the unlock code for your phone. They will probably ask WHY you want the unlock code. Tell them that you will be going out of the country and need the phone unlocked in order to use a pre-paid SIM card in the country of destination. They will then get you the unlock code typically within three days. Hope this helps.