Question about LG Shine CU720 Cellular Phone
Typically when a phone is asking for a PUK code it means you have tried to edit or set the secuirty pin code. Unfortunately these codes are already predefined by the sim card and the service provider. It gives you the sensation that you can set or change the code but you cannot. You get 3 attempts to enter the correct code after which the phone asks for a PUK code. When it asks for the PUK you also get three tries to undo it. Again PUK codes are predefined by the sim card and the service provider. If you call your service providers technical support number or customer service number they can provide you with the PUK or the PIN code.
>>>> Once the PUK has been entered in wrong 3 times the sim card is shot and deactivated. At this point you will need to get a new sim card to get your phone up and running again. If you have numbers stored to your sim card and not to your phone you will have lost them.
I have seen if you log into your ATT.WIRELESS.COM account you can see your PUK code there.
Posted on Mar 10, 2010
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Posted on Jan 02, 2017
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These directions are for an AT and T phone, but other than that would be 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
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