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If you insert the wrong PIN code three times, your SIM card is locked, and you need its PUK code to unlock it. The PUK code is unique to each SIM card, and entering it incorrectly too many times (usually ten) can get your SIM disabled, so it's important to use the correct one.
If it's asking for a PIN, try the default SIM PINs of '1234' or '5678'. If you get a prompt about a PUK code or your SIM is locked, Contact Us to request your PUK code. If you're prompted to enter the PUK code, enter it.
How to use the PUK code to unlock your Android’s SIM card. Inserting the PIN code incorrectly three times in a row disables your SIM card. If you get a message that you must contact your carrier to unlock your device, press OK. Your phone then shows the PUK screen.
Learn how to get the PIN Unlock Key (PUK) code to unlock your SIM card. Devices display Enter PUK after more than three wrong PIN entries.
Protecting your SIM card with a PIN can prevent unauthorized use of your cellular plan, but if you enter your SIM PIN incorrectly three times, you'll need an 8-digit PUK (Personal Unlocking Key) to unlock it. This wikiHow article will teach you how to get your PUK code from your mobile provider and unlock your SIM card.
The default PIN and Unblocking Key (PUK) key display once link is clicked. If your SIM card is locked and you're unable to make or receive calls or connect to internet, here's how to find the SIM unlock PIN / PUK.
Don't worry—you can still unlock your phone by entering your Personal Unlock Key, or PUK code. If you don't know your PUK code, there are easy ways to get it. This wikiHow article will help you find the PUK code for your phone or tablet's SIM card, and how to enter this 8-digit number to unlock your SIM.