SIM Network Unlock Pin (NUP) is a code used to unlock an Android phone or iPhone from its original carrier so that it may be used on other carriers. This code is typically 8 or 16 digits long and is used to unlock a smartphone.
The SIM card lock has been on top budget Android phones for years, but many people are unaware of the feature. Once you enable SIM lock on your Android phone, you'll enter the same four-digit passcode after a device reboot or when you transfer the SIM to another phone.
Each operator has a default passcode, usually 1111, 0000, or 1234.
By default, your SIM PIN is the last four digits of your PUK. You can change your SIM PIN through your device settings. So, if you've forgotten your SIM PIN, enter a random 4-digit number, like 0000, until you're asked for your PUK code.
What Is SIM Network Unlock PIN? SIM Network Unlock Pin (NUP) is a code used to unlock an Android phone or iPhone from its original carrier so that it may be used on other carriers. This code is typically 8 or 16 digits long and is used to unlock a smartphone.
On your SIM packaging
Your PUK code is the 8 digit number found on either the SIM or the additional SIM packaging.
You can remove a SIM lock on your Android device in simple ways. You can look for your carrier's contact and ask them to give you an unlock code to bypass a SIM lock. But this happens only if the SIM card is locked to a network. You can still use an IMEI number or input a PUK code.
This can be done with most Android smartphones, and only Samsung phones have the ability to unlock through a settings menu. If you have a Samsung phone 2019 or later, head to Settings > Connections > More Connection Settings > Select Network Unlock.
Can I Unlock My SIM Card Myself? Yes, you can unlock a SIM card yourself. You can simply contact your SIM card provider company or use any third-party app for the same. While contacting your network provider is a time-taking process, turning to the SIM carrier may avoid jailbreaking your iPhone.
If you enter your PIN (Personal Identification Number) code incorrectly several times, the SIM card is locked.
(Subscriber Identity Module lock) A function in GSM cellphones that restricts the phone's use to a particular cellular carrier identified by a SIM card. SIM locks are used to ensure subscribers finish their service contracts. If the contract period is over, the phone may be unlocked by entering a code from the carrier.
The PUK (Personal Unblocking Key) code is a code consisting of 8 digits. It is used to unblock your SIM card when you entered 3 times a wrong PIN code.
The 19- to 21-digit number is the identifier of the SIM card itself, i.e. the SIM chip. ICCIDs are stored in SIM cards and are typically printed on the back of a card during a process called personalisation in SIM manufacturing. Nowadays, ICCID numbers are often also used to identify eSIM profiles.
Borrow a SIM card from a friend or family member that's from a different network to the one you've been using, and pop it into your phone to check whether you have any signal. If not, it's likely that your phone is indeed locked.
If unavailable, ensure a SIM card is properly inserted. The default SIM PIN is 1111.
Generally, you need PUK number to unlock SIM when it gets locked. But luckily, there are still ways for you to unlock SIM card without PUK. You can always ask your service provider to help you after confirming your identity. And even if you fail, professional SIM unlock tools are still there to help you.
Find your PUK on the SIM card pack
If you've still got the little pack that the SIM came in, check on the credit-card sized bit of plastic that the SIM snapped out from. The PUK Code is an eight digit number, and is usually printed on the back.
If you by yourself enter the wrong SIM PIN three times over, you can reset it by entering the PUK code, which is named like that because it is your SIM's PIN Unlock Code.
A PUK is required when you want to unlock a phone. You'll need one in the event that your handset is locked by your current network and you want to use a SIM card from another network. You'll also need to get a PUK code in the event that you mistakenly enter the wrong PIN code and you are automatically locked out.
A PUK code is a security feature on your sim card that, where you can choose to have your sim request a PIN code when your phone is switched on. If this code is entered incorrectly three times, your sim card will lock itself, and this can only be unlocked using your PUK code.
What does it mean when a phone is locked? When a handset is locked it means it will only work with the provider that you bought it from. If your phone is locked it won't automatically become unlocked when your contract expires with your provider. You'll have to specifically ask your carrier to unlock it.