How to Unlock a Locked SIM Card | SIM card PIN & PUK code | GP Robi Airtel Teletalk Banglalink 

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How to Unlock a Locked SIM Card | SIM card PIN & PUK code | GP Robi Airtel Teletalk Banglalink
Locking a SIM Card
You can set a SIM PIN code to prevent people from accessing data such as contacts stored on the SIM card without your permission, even if they physically have your phone and then steal the card. This is separate from a passcode or a biometric lock you might set on the phone itself, since it's designed to protect the data on the SIM, not the phone.
On an Android phone, you can set a SIM PIN, using the Settings menu. Tap the Settings app on your home screen, then tap to go to the "Security" or "Fingerprints and Security" submenu. Tap "Set up SM Card Lock" and select "Lock SIM Card" to lock the card. Generally, you'll have to enter the existing default SIM lock PIN, which you can obtain from your phone maker or carrier, although you can change it afterward, through the same menu.
On an iPhone, tap "Settings," then "Phone," then "SIM PIN" to turn the lock PIN on or off. If you don't know the existing PIN, contact your carrier for help.
Getting a PUK Code
If you enter the wrong SIM card PIN repeatedly, your SIM card will lock as an added security measure. This prevents someone from simply guessing every possible PIN to access your data if they steal your phone or SIM card.
Once the SIM card is locked, you will need to use a separate code called a PUK code to unlock it. Your carrier can provide you with the PUK code for your SIM card. You can sometimes find this on your carrier's website after you log in, and you can usually also obtain it by calling customer service or taking the phone to a carrier store. Once you have the PUK code, you can enter it and reset your SIM PIN to one you know.
If you don't know the SIM card's PUK code, don't try to guess it. The SIM card can become permanently locked and need to be replaced, potentially losing your data, if you repeatedly enter an incorrect PUK code.
When the phone switches from asking for a PIN to asking for a PUK, stop entering codes. If you enter the PUK code wrong too many times, the PUK will lock permanently and you will need to buy a new SIM card.
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