How to unlock using: Sim Network Unlock Pin and Master Code |

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How to unlock using: Sim Network Unlock Pin and Master Code

Cell Phone POP up messages Terminology Explained:

It is often easy to get confused with all the different terminology centred around cell phone codes. 

Searching the internet I have not found anyone explaining the differences in a comprehensive manner.


Here I will attempt to explain, what each message actually means.


Basically there are 3 types of PIN numbers that your phone could be requesting.  

1) The Screen Unlock PIN

2) The SIM card PIN

3) The network PIN

Before giving examples of the above types of PIN codes that your phones may be requesting. Let me explain each one in some detail:

1) The Screen Unlock PIN is basically the 4 or 6 digit pin or an alpha numeric password that you created to unlock access to your screen.  Normally you enter this  PIN every time you want to use your phone or after a reboot.  In the old days, if you forgot your PIN number you can simply reset it using your email address.   If you don't have access to the email address then some other information to get it reset is required. 

If even that did not work, then an option would be to factory reset your phone, meaning ALL YOUR DATA would be erased  including the PIN number you had set (allowing you to use your phone again).  Now Google along with Android had recently created what they call, Factory Reset Protection (also known as FRP).  This is similar to Apple's iCloud activation lock in the sense that if you don't have the PIN number or the info to reset it, then essentially you would never be able to get into the phone again, since Factory Reset Protection would prevent your from resetting the phone (and removing the old PIN number).

There are some work around's to this, and we are able to bypass the Factory Reset Protection for most phones.  Please contact us if you are interested in this service.


2) The SIM card PIN, is the PIN number that came by default on your SIM card or the SIM card PIN that you set yourself. The purpose of the having a SIM PIN is if someone found your SIM card they would not be able to make a call or access the info on it without first entering your SIM card PIN number.  An easy way to check this, insert a different SIM card into the phone and it should no longer ask for a SIM PUK. Essentially the SIM PUK does not have to do with the phone itself, only the SIM card in it.

The Sim card PIN number is also referred to as the SIM PUK.  Here P.U.K is an acronym for Pin Unlock Key.  Some carriers also put a SIM PUK on your SIM card when they sell you the SIM card.  Often the PUK is written on the packaging that comes with the SIM card.  The default PUK code is usually 1234 or 0000.  Either way, if you never created a PUK for your SIM, you can easily call your SIM card provider and they should be able to give you this 4 digit SIM PUK number for free.


3) The SIM network Unlock PIN,  has nothing to do with the screen PIN or SIM card PIN.  It has to do with what network your phone was made for.  When you bought your phone from a certain network carrier, they placed a PIN on the phone so that you can only use it with their Network.  This is usually what is refered to as Network Locked.  Now to unlock your network you need a Network Unlock Code.  Here is where it gets a little confusing.  This network unlock code goes by many different names.  And some phones (Apple) do not have codes at all. In the case of Apple products, the network is unlocked through iTunes (after making a request through the carrier or through a 3rd party unlocker).  The common names for Network unlock codes are: Network Control Key, NCK,  Sim Network Unlock Pin, Network Unlock Code, Network Unlock PIN, Master Unlock Code, SIM network PIN  and many other variations of those words.  

More specifically, a SIM Unlock  allows the SIM slot of your phone to accept another carrier's SIM card (either locally or internationally.) 

Unfortunately all phones don't  use the same terminology  so that makes it more confusing!  A simple way to remember is that if the POP up message has the word "NETWORK" anywhere in it, that means that is has to to with unlocking your network.  If the word "NETWORK" is not found in the message, then your phone asking for the SIM pin or the Screen PIN.  

Here are examples of the different wordings in the POP up messages your phone uses and what they mean:

Term used:

It refers to:
  • Enter Passcode (iPhone)
  • Enter PIN 
  • Enter Unlock PIN
  • Enter Password to Unlock
  • Use Fingerprint or Enter PIN
  • Enter Pin Code
  • Enter Password
1) Screen Locked
  • SIM card PIN
  • PUK Locked
  • PIN code Blocked Enter PUK code
  • SIM card has been locked. Enter PUK1 code
  • Enter SIM card PUK
  • PUK code
  • Enter PUK code
2)SIM card Locked
  • Network Unlock Code
  • SIM Network Unlock PIN
  • Network Control Key
  • SIM PUK code
  • Master Unlock Code
  • SIM network PIN blocked
  • Network Pin
3)Network Locked








Network Control Key

Pin Unlock Key

Service Provider Control Key

Master Control Key (known as Unfreeze code)

Secondary Control Key



A SIM network unlock Pin is easily mistaken as the 4 digit PIN number associated with your SIM card, however this is not the case.  The SIM network unlock Pin is actually the unlock code to unlock your Network.  This is often referred to as the Network Unlock Code, Network Control Key (NCK),  Master Unlock code,or SIM network PIN. Your phone will typically prompt for one of the following messages: SIM network PIN blocked, Enter the network PUK, Enter lock PIN, SIM PUK code etc.



Simplified Instructions:


Step 1. Insert an unaccepted SIM card into your phone and confirm it asks for a Sim Network Unlock Pin 

Step 2. Order Unlock Code

Step 3. Insert the Code Provided 

Step 4. Restart your Phone 



Frequently Asked Questions:


What if the phone says: "Device is Blocked please enter Master Unlock Code" [Solved]


1. Insert an unaccepted SIM card into your phone and confirm it asks for a Master Unlock Code 
2. Order your  Master Unlock Code by selecting the service called: Samsung - Canada Network, Unfreeze & Master Code

3 - Switch ON your Samsung with a non compatible SIM Card,
4 - Wait for your phone to ask for "SIM Network Unlock PIN" or "Enter Network Lock Control Key",
5 - First enter your MCK code (Defreeze Key) code and hit "Unlock" button. 
Note: You will get "Unsuccessful message" but don't worry that's fine when you type MCK (Unfreeze code).
6 - Now type the NCK (Network Code) and hit the "Unlock" button.
7 - Your phone is now Unlocked !

EXTRA INSTRUCTIONS: if you get an "Unlock Unsuccessful" message again after you type the NCK code (NETWORK CODE) as described above then:


WARNING: Back up your DATA before proceeding to the next steps (as your phone will be erased and restored to factory settings)
7 - Then hit "Dismiss" button and compose *2767*3855# on your phone keypad (as if you were dialing a phone number).
8 - Wait for the phone to restart, this operation will erase all data from your phone!
9 - Retry the step 1 to 5 above !


Some Samsung phones need to follow extra troubleshooting steps in order to accept the unlock code. Please follow these steps if your model is mentioned below and you previously got an UNLOCK UNSUCCESSFUL result from the regular instructions:


Samsung Galaxy S2, S3, Note, Note 2 Unlock Code Fail -[Solved]

Follow these step carefully, as long as you have the correct code it will work 100% (Your phone must be updated to the latest firmware!)

The code must be correct and the phone MUST prompt for the code.

a. Go to the Dial pad and dial *#197328640# 
b. Please click on number [1] UMTS > [1] Debugging screen > [8] Phone Control > [6] NETWORK LOCK
c. You will see 3 options
d. Please click on number [1] Perso Sha256 INFO, the screen will change slightly
e. Please hit the MENU button then when the menu pops up please carefully hit BACK to return to the previous screen
f. Please click on number [2] Perso Sha256 ON, the screen will change again to a one line message
g. Restart the phone on the screen by holding the power button and click RESTART
h. When the phone prompts for the unlock code simply enter the unlock code
i. Your phone is now permanently unlocked!



What if my phone is Region locked and requires the RGCK unlock code?[Solved]

If you bought an unlocked Samsung in Europe or the United Kingdom and when travelling abroad the "unlocked" cell phone still  requests an unlock code, it means that the phone was only unlocked for a specific region (Europe).  That means  you will need to purchase an unlock service that includes the  Regional Unlock  code or Region Control Key (RGCK) option that we can provide you with.  It is a specific type of unlocking for Samsung equipment purchased, especially found in Europe.

"What is the PIN to unlock SIM?"

The default PIN on the sim card is 1234 or 0000, however if your phone asks for a Network PIN then it is referring to a 8 or 16 digit network unlock code which must purchased or obtained from the carrier or a 3rd party unlocking service such as

"What does it mean when your phone asks for a SIM network unlock PIN?"

It means your phone is network locked to the original network carrier. It can not be used with any other sim cards until it gets network unlocked by inserting a 8 or 16 digit unlock code.

"What is the network unlock code for Samsung?"

The network unlock code for Samsung phones prior to 2019 is a 8 digit number, This number is calculated based on the IMEI number and is unique for every phone. Many 2019 Models require a 16 digit network code. Some Samsung models require the defreeze code to be entered first followed by the network code.


"What is the 8 digit PUK code?"

The 8 digit puk code is referring to the network PUK. PUK stands for Personal Unlock Key. The Network PUK can be obtained from your network carrier or a 3rd party unlocking company such as

"How do I find out my PUK code for my SIM card?",

The defaults PUK for your sim card is 1234 or 0000. Some carriers have set a default PUK which is written on the original sim card or sim card packaging. When In doubt call your network provider and they can give it to you.

"Can you unlock your phone for free?"

It is only possible to unlock your phone for free by calling your original network carrier.  If you meet their requirements they will give it to you for free otherwise they will charge a fee. Often you can get it cheaper at third party unlock services such as The old days of free online calculators do not work on new security phones since 2012

"How does a SIM card get locked?"

A SIM card gets locked from inserting the wrong PUK code too many times. In such cases you would need to purchase a new SIM card.

"Can I unlock my SIM card?"

Yes you can remove the PUK from your sim card by entering the required 4 digit PIN. Be careful when entering your PUK code. If you enter the wrong PUK code 10 times, your SIM card will be blocked permanently. In that case you will need to buy a new SIM card. For network unlocking you would need to unlock your device to accept different sim cards at

"Does removing a SIM card unlock a phone?"

Removing your SIM card will not unlock your phone. To network unlock your phone you will need to enter the 8 or 16 digit network unlock code purchased at

"How do I get my phone unlocked?"

To get your phone network unlocked  you need to insert the 8 or 16 digit network unlock code. Every phone has a unique unlock code based on it's IMEI number. You can purchase this code from

"What happens if you put a SIM card in a locked phone?"

If you put a sim card in a locked Android phone then the phone will automatically prompt for a SIM NETWORK UNLOCK PIN. You can purchase this code from If you a put a SIM card in an iPhone then it would simply say "sim card not supported"

"Can you put a SIM card in a locked phone?"

Yes you can put a SIM card in a locked phone but you will not be able to make or receive phone calls until you have network unlocked the phone.

"How do you know if a phone is unlocked?"

The simplest and most reliable way to know if your phone is unlocked is to insert a  SIM card from one or more different companies. you can make a phone call with the new simc ard it means that your phone is network unlocked, If the phone prompts for a code it means that it is locked to a particular network.

"Can you unlock a carrier locked phone?"

Yes almost all phones can be carrier unlocked by inserting the correct sim network unlock pin which can be obtained at

"What is the difference between locked and unlocked phones?"

Locked and Unlocked phones refers to network lock which is a restriction placed on the phone by the original network carrier which does not allow any sim cards from other carriers to work in the phone. Once the phone has been UNLOCKED then it can work on all supported phone companies in the world.

"Does factory reset lock phone again?"

By factory resetting your network unlocked phone the phone will remain unlocked. A network unlock is permanent and can not be relocked afterwards.

"How do you check what network a phone is on?"

The easiest was is to test different sim cards in the phone. If you put in a sim card into a phone that it is not from, then it will prompt automatically for a sim network unlock code. If it doesn't prompt for this code then it means the phone is from that network provider. You can also purchase a imei check service to find the original carrier.

"Why does my phone say no service?"

No service can mean that your phone is blacklisted, not supported by the network or has a firmware issue. Sometimes, your phone will stop saying No Service if you remove your SIM card and then put it back in again. You can also try to restart your phone and reset the network settings by going to settings the general then reset then Reset network settings.

"How do I fix my phone if it says no service?"

If it says no service because it it blacklisted then you have to unblacklist it by providing the original proof of purchase. If it says no service due to a firware glitch then remove the SIM card, re-insert it and restart your phone. You may also try to reset the network settings by going to settings the general then reset then Reset network settings.


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Safe, Fast & Easy!

100% Guaranteed to Permanently Factory Unlock your Samsung. Your Samsung will remain unlocked even after updating firmware. Simply Insert a SIM card from a different company (then the company your phone is locked to) and it will ask for a code. Enter the code we provided and press OK. Now your phone is unlocked!


Please select the network your SAMSUNG is currently locked to. If it is not listed in the networks below. If you are not sure of your Network, please contact us first.

Also Please make sure your Samsung has been activated first with the Network it is currently locked to. (You must be able to access the home screen of your Samsung.