TL;DR Quick Answer
The Fastest Way to Enter Your Samsung Unlock Code
Insert a SIM card from a different carrier into your Samsung phone. When prompted with “SIM Network Unlock PIN” or similar message, simply type in your 8-digit NCK (Network Control Key) code and tap Unlock. If no prompt appears, dial #7465625*638*UNLOCKCODE# from your phone’s dialer.
Insert foreign SIM
Power on device
Enter NCK code
Tap Unlock
Understanding Samsung Unlock Codes
When you purchase a Samsung phone from a carrier, it’s typically locked to that specific network. To use your device with other carriers, you’ll need special codes to remove this restriction. Here’s what each code means:
The primary unlock code. Most Samsung phones only need this one to unlock.
Removes service provider restrictions (used by MVNOs like Cricket, Metro).
Also called Defreeze code. Resets counter after too many wrong attempts.
Removes network subset lock. Rarely needed on modern devices.
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Good news: Most carriers only lock Samsung phones with the Network lock (NCK). In 90% of cases, you’ll only need to enter the NCK code to fully unlock your Samsung device.
Default Method (Works on Most Samsung Models)
This is the standard method that works on most modern Samsung phones including the Galaxy S series (S25, S24, S23, S22, S21, etc.), Galaxy A series, Galaxy Z Fold/Flip, and Galaxy Note series.
Take out your current SIM and insert a SIM card from a different carrier. This is known as a “foreign” or “non-accepted” SIM card because your locked phone won’t recognize it.
Turn on your phone with the new SIM card inserted. Make sure Airplane Mode and Wi-Fi are turned off in your wireless settings.
Your Samsung will detect the foreign SIM and display a message asking for an unlock code. Common prompts include: “SIM Network Unlock PIN,” “Network Unlock Code,” “Enter Network Lock Code,” or “SIM Network PIN Blocked.”
Carefully type in your 8-digit NCK (Network) code in the input field. Double-check each digit before submitting.
After entering the code, tap the Unlock button. If successful, you’ll see “Network Unlock Successful” or a similar confirmation message.
Success!
Once unlocked, your Samsung phone can now accept SIM cards from any compatible carrier worldwide. Restart your device to ensure the changes take effect.
Alternative Entry Methods
If your Samsung doesn’t automatically prompt for an unlock code, or if the default method doesn’t work, try these alternative methods:
Method #1: Dialer Code Entry
This works when your phone doesn’t show the unlock prompt automatically:
CODE
#7465625*638*UNLOCKCODE#
Replace UNLOCKCODE with your actual 8-digit NCK code. Open your phone’s dialer and type this sequence exactly as shown, including the # and * symbols.
Method #2: Alternative Dialer Code
If Method #1 doesn’t work, try this alternative code format:
CODE
#0111*UNLOCKCODE#
Some older Samsung models respond better to this code format. Enter it in your dialer app.
Method #3: Direct Code Prompt
Type this from your dialer with a non-accepted SIM inserted:
CODE
#7465625*638*#
This will bring up a “Network Lock” screen where you can enter your unlock code directly.
How to Check Which Locks Are Active
Before entering any codes, it’s helpful to know which locks are actually enabled on your device. Dial this code to check:
CODE
*#7465625# (or type *#SIMLOCK#)
This displays a menu showing the status of all locks:
Entry Methods Comparison Table
| Method | Code Format | When to Use | Success Rate |
|---|---|---|---|
| Auto Prompt | Enter code when prompted | Phone shows unlock screen | 95% |
| Dialer #1 | #7465625*638*CODE# | No auto-prompt appears | 90% |
| Dialer #2 | #0111*CODE# | Method #1 doesn’t work | 75% |
| SP Lock Entry | #7465625*77*SPCK# | Service Provider locked | 85% |
| Subset Lock | #7465625*782*SCK# | Subset lock is ON | 80% |
| No SIM Method | **CODE# (older models) | Z series, older Samsung | 70% |
⚠️Handling “Phone Freeze” or Hard Lock
If you enter the wrong unlock code too many times (usually 3-5 attempts), your Samsung may become “frozen” or “hard locked.” You’ll see messages like “Phone Freeze,” “SIM Unavailable,” “Enter MCK,” or “Contact Service Provider.”
Don’t panic! This is fixable. You’ll need the MCK (Master Control Key) code, also called the Defreeze or Unfreeze code. Here’s how to resolve it:
The phone will display “Phone Freeze” or similar message.
Type your MCK code and press OK. Note: On some models, no digits will appear on screen while typing – this is normal.
After the defreeze code is accepted, the phone will prompt for the Network Code. Enter your NCK code and press OK.
Try: #7465625*638*NCKCODE#
These models may show “Network Lock Unsuccessful” when frozen, even though they don’t display a freeze message. If this happens, enter the DEFREEZE code first (it may also say unsuccessful), then immediately enter your NCK code. This sequence typically works.
Model-Specific Instructions
Different Samsung models may require slightly different code formats. Here are specific instructions for popular models:
Insert foreign SIM → Enter code when prompted
The primary unlock code. Most Samsung phones only need this one to unlock.
#7465625*638*NCKCODE#
If no auto-prompt, use the dialer code method. Works reliably on most A-series devices.
Use default SIM prompt method
Foldable devices work like the S series. Insert a different carrier’s SIM and enter code when prompted.
#0149*MCKCODE# or #0111*NCKCODE#
Try MCK code first with J series. If that doesn’t work, try the NCK code format.
**CODE# or #7465625*638*CODE#
For Z510, Z320i, Z650i use **CODE#. For D and P series, try the standard dialer format.
Device Unlock App Required
Some T-Mobile and Metro PCS Samsung phones require the Device Unlock App instead of a code. Check with your carrier.
Troubleshooting Common Issues
Double-check you’re entering the correct code type. If you have NCK and SPCK codes, try both. Also verify you’re including all 8 digits correctly.
Your phone may be frozen without displaying it. Try entering the DEFREEZE/MCK code first, then enter the NCK code immediately after.
Make sure Airplane Mode and Wi-Fi are turned OFF. If still no prompt, use the dialer method: #7465625*638*CODE#
Restart your phone, ensure Airplane Mode is off, and check that your new SIM card is properly activated with your new carrier.
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How to verify your phone is unlocked: Dial *#7465625# to check the lock status. If all locks show [OFF], your phone is successfully unlocked. Alternatively, the confirmation message “Network Lock Deactivated” or “Not Yet Personalized” means you’re good to go!
There is no universal default code. While some people try 0000 or 00000000, these rarely work on modern Samsung devices. Each locked phone has a unique 8-digit unlock code based on its IMEI number. You’ll need to obtain this code from your carrier or a legitimate unlock service.
Most Samsung phones allow 3-10 attempts before becoming frozen (hard locked). The exact number varies by model and carrier. To avoid issues, double-check your code before entering it, and make sure you have the MCK/Defreeze code ready just in case you trigger a freeze.
You have several options: (1) Contact your carrier directly – they may provide it for free if your contract is complete or device is paid off. (2) Use a reputable third-party unlock service that generates codes based on your IMEI. (3) Contact Samsung Support, though they typically redirect you to your carrier.
No, carrier unlocking using the official unlock code method does not void your warranty. This is a legitimate process that doesn’t modify your phone’s software or hardware. However, be cautious of methods that involve rooting or flashing – those could affect your warranty status.
NCK (Network Control Key) is the primary unlock code that removes the carrier network restriction. MCK (Master Control Key) or Defreeze code resets your phone when it’s been locked after too many incorrect attempts. SPCK (Service Provider Control Key) removes secondary locks from MVNOs like Cricket or Metro PCS. Most users only need the NCK code.
Some carriers like T-Mobile and Metro PCS use a Device Unlock App instead of traditional codes. You’ll need to use this app and meet your carrier’s unlock requirements (contract complete, device paid off, etc.). If you’re eligible, the app will unlock your device automatically. Some third-party services also offer remote unlocking for these devices.
Yes, if you’ve met your carrier’s requirements (completed contract, paid off device, active account for required period), most carriers will provide the unlock code for free. Contact your carrier’s customer service and request an unlock. If they refuse or you don’t meet requirements, third-party services are available for a fee.
First, try all the different entry methods listed in this guide. If none work: (1) Verify you have the correct code type for your lock. (2) Make sure the IMEI used to generate the code matches your device. (3) Check if your phone is blacklisted (lost/stolen reported). (4) Contact the code provider for a replacement or refund. (5) Try a different unlock service if using a third-party.
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