Complete Guide to Samsung Secret Codes and Hidden Features (2025)
Have you ever wondered what hidden features are lurking inside your Samsung Galaxy phone? Your device has dozens of secret diagnostic tools, testing modes, and advanced settings that Samsung doesn’t advertise—all accessible through simple dial codes.
These secret codes, often referred to as USSD or MMI diagnostic codes, can help you check your battery health, test your screen, view detailed hardware information, and troubleshoot problems without visiting a service center. Whether you’re a tech enthusiast wanting to explore every corner of your device or someone looking to diagnose a problem, this complete guide will show you every Samsung secret code that works in 2025.
⚡ Quick Jump to What You Need:
- Top 5 Most Useful Codes
- Testing & Diagnostics
- Battery & Hardware Info
- Network & Connectivity
- ⚠️ Dangerous Codes (Avoid!)
- Troubleshooting
Top 5 Most Useful Codes (Quick Reference)
Don’t have time to read everything? Start here:
| Code | What It Does | When to Use It |
|---|---|---|
*#0*# |
Complete hardware test menu | Before buying a used phone, diagnosing issues |
*#0228# |
Battery health check | Phone draining fast or overheating |
*#06# |
Display IMEI number | Reporting stolen phone, carrier unlock |
*#0011# |
Network signal testing | Poor reception, checking 5G connection |
*#1234# |
Software version info | Before updates, troubleshooting |
⬇️ Scroll down for the complete list with detailed explanations
Table of Contents
- What Are Samsung Secret Codes?
- How to Use Samsung Secret Codes
- Testing & Diagnostic Codes
- Information & System Status Codes
- Camera & Display Codes
- Network & Connectivity Codes
- Advanced & Developer Codes
- ⚠️ Dangerous Codes – Use with Caution
- Samsung One UI Hidden Features
- Model-Specific Information
- Troubleshooting
- Safety Tips & Best Practices
- FAQ
How These Codes Were Tested
Methodology & Device Coverage:
This guide was compiled and tested across multiple Samsung Galaxy devices to ensure accuracy:
Devices Tested:
- Galaxy S24, S23, S22, S21 (flagship series)
- Galaxy A54, A34 (mid-range series)
- Galaxy Z Fold 5, Z Flip 5 (foldable series)
- Various older models (S10, Note 20)
Testing Period: December 2024 – January 2025
Important Notes:
- Code availability varies by model, region, carrier, and firmware version
- Some codes work differently on international vs. US models
- Carrier-locked phones may have restricted codes
- One UI version affects some code functionality
Disclaimer: While we’ve tested these codes on multiple devices, we cannot guarantee every code will work on every Samsung model. Always test carefully and read warnings before using advanced codes.
What Are Samsung Secret Codes?
Samsung secret codes are special diagnostic codes (often called USSD codes, MMI codes, or service codes) that you enter into your phone’s dialer app to access hidden menus, diagnostic tools, and advanced settings. These codes are built into Samsung’s Android operating system and are primarily used by technicians and developers for testing and troubleshooting.
Think of them as “cheat codes” for your phone—they give you access to features and information that Samsung doesn’t display in the regular Settings app. Unlike third-party apps that require downloads and permissions, these codes are already built into your device.
Technical Note: While commonly called “USSD codes,” not all Samsung diagnostic codes are true USSD (Unstructured Supplementary Service Data) codes that interact with your carrier network. Many are MMI (Man-Machine Interface) codes or manufacturer-specific diagnostic commands that work entirely on-device. For simplicity, we’ll refer to them all as “secret codes” or “diagnostic codes.”
How These Codes Work:
- They typically use the format
*#code#or*code# - They’re entered directly into the Phone app’s dialer
- Most execute immediately when you finish typing the final
# - They work offline without internet connection
- They’re free to use (no carrier charges)
Are They Safe? Most diagnostic and information codes are completely safe and designed for user access. However, some codes can reset your device or change critical settings, so always read the description before using any code. We’ll clearly mark potentially dangerous codes throughout this guide.
How to Use Samsung Secret Codes
Using Samsung secret codes is incredibly simple. Here’s the step-by-step process:
Step 1: Open your Phone app (the green dialer icon)
Step 2: Switch to the keypad view if you’re not already there
Step 3: Type the secret code exactly as shown (including asterisks and hash symbols)
Step 4: The code usually executes automatically when you type the final #
Step 5: Explore the menu or read the information displayed
Step 6: Press the back button or home button to exit
Important Tips:
- Type codes carefully—one wrong digit can trigger a different function
- Don’t interrupt the process once a code starts running
- Take screenshots of important information for your records
- Exit menus properly rather than force-closing the app
- Keep a backup before using any reset or factory codes
Now let’s explore the complete list of Samsung secret codes, organized by category.
Testing & Diagnostic Codes
These codes help you test your phone’s hardware components and diagnose potential issues.
1. *#0*# – General Test Mode (LCD Test)
What it does: Opens a comprehensive testing menu with buttons to test every hardware component of your phone.
Available Tests:
- Red, Green, Blue screen tests (check for dead pixels)
- Touch screen sensitivity and multi-touch test
- Dimming test (check brightness levels)
- Camera test (front and rear)
- Sensor tests (proximity, accelerometer, gyroscope)
- Vibration test
- Sleep mode test
- Speaker and microphone tests
- LED notification light test
How to use it:
- Enter
*#0*#in the dialer - The test menu typically opens immediately
- Tap any test button to run that specific test
- For screen tests, tap the screen to cycle through colors
- Press back button to return to the main test menu
- Press back again to exit completely
When to use it: Before buying a used Samsung phone, after dropping your phone, or when diagnosing hardware issues.
Model variations: The test interface layout may differ between One UI versions and models, but functionality remains similar.
Pro Tip: Use the screen color tests in a dark room to better identify dead pixels or screen uniformity issues.
2. *#7353# – Quick Test Menu
What it does: Provides quick access to commonly used diagnostic tests without the full interface of *#0*#.
Available Options:
- Melody test (speaker audio test)
- Vibration test
- Dimming test
- Camera test (quick photo test)
- Sensor test
When to use it: Quick diagnostics when you don’t need the full test suite. Particularly useful on older Samsung models where *#0*# might not be available.
Best for: Quick diagnostics when you don’t need the full test suite.
3. *#0228# – Battery Status
What it does: Displays detailed information about your battery’s health, temperature, voltage, and charging history.
Information Shown (varies by model):
- Battery level (percentage)
- Battery health status (Good/Normal/Weak)
- Battery temperature (in Celsius)
- Voltage (in millivolts)
- Battery technology type
- Time since last charge
- Total charging time
- Charging cycle count (on some models)
How to interpret results:
- Good/Normal: Battery is healthy
- Weak: Battery capacity has degraded significantly
- Temperature over 40°C: Phone may be overheating
- High cycle count (>500): Battery may need replacement soon
When to use it: If your phone drains quickly, overheats, or shuts down unexpectedly at high battery percentages.
Model-specific note: The exact information displayed varies significantly by model and One UI version. Some newer models show less detailed information in this menu than older models.
Important: This code works on most Samsung Galaxy models but the specific data shown may differ depending on your device, firmware version, and region.
4. *#0842# – Vibration and Backlight Test
What it does: Tests your phone’s vibration motor and screen backlighting system.
Tests included:
- Vibration motor intensity test
- Screen backlight levels
- Haptic feedback response
When to use it: If your vibration feels weak or inconsistent, or if screen brightness seems uneven.
Note: On some models, this code may only test vibration or may not be available at all.
5. *#2663# – Touch Screen Version and Test
What it does: Shows your touchscreen firmware version and allows you to test touch sensitivity.
Information displayed:
- Touch screen firmware version
- Touch controller hardware revision
- Manufacturer information
Tests available:
- Single touch test
- Multi-touch test (up to 10 fingers on most devices)
- Touch sensitivity test
- Dead zone detection
When to use it: If you’re experiencing ghost touches, unresponsive areas, or multi-touch issues.
Model variation: Availability and exact information shown varies by device model.
6. *#0289# – Melody Test (Ringtone Test)
What it does: Plays different melodies through your speaker to test audio output quality and volume levels.
Tests:
- Left speaker
- Right speaker (if dual speakers)
- Earpiece speaker
- Different frequency ranges
- Volume levels
When to use it: If your speaker sounds distorted, crackling, or quieter than usual.
7. *#03# – Firmware Serial Number (NAND Flash S/N)
What it does: Displays the serial number of your phone’s internal storage chip.
Information shown:
- NAND flash memory serial number
- Storage manufacturer
- Production date code (on some models)
When to use it: Rarely needed by typical users, but useful for warranty claims or verifying genuine hardware.
Information & System Status Codes
These codes display detailed information about your device without making any changes.
8. *#1234# – Software Version and Firmware Info
What it does: Shows comprehensive version information about your phone’s software.
Information displayed:
- PDA version (Android version and security patch)
- CSC version (Country/Region-specific code)
- Phone version (Baseband/Modem version)
- Hardware version
- Build number
When to use it: Before updating firmware, when troubleshooting software issues, or verifying your phone’s origin and region.
Why it matters: This information helps you determine if your phone has the latest updates and if it’s carrier-locked or region-specific.
9. *#12580*369# – Complete Software and Hardware Information
What it does: Displays the most comprehensive system information available through secret codes.
Information categories:
- Software version details
- Hardware revision
- RF (radio frequency) calibration date
- Manufacturing date
- Model number
- Serial number
When to use it: When you need complete device specifications for warranty claims, insurance, or technical support.
Model variation: Information depth varies by Samsung model and One UI version.
10. *#2222# – Hardware Version
What it does: Shows detailed hardware revision information.
Information displayed:
- Hardware model number
- Revision number
- Component versions
- Manufacturing information
When to use it: To verify if replacement parts are genuine or to check hardware compatibility for custom ROMs.
11. *#06# – IMEI Number
What it does: Instantly displays your phone’s IMEI (International Mobile Equipment Identity) number.
What is IMEI:
- Unique 15-digit identifier for your phone
- Used to track stolen devices
- Required for warranty claims
- Needed to unlock your phone from carrier
- Can be used to block stolen phones from networks
When to use it:
- Before reporting a stolen phone
- When contacting customer support
- To check if your device is blacklisted
- For carrier unlock requests
- When filing insurance claims
Pro Tip: Write down your IMEI and store it separately from your phone. You’ll need it if your device is ever lost or stolen.
Alternative method: IMEI is also printed on the SIM tray and original box.
12. *#0011# – Service Mode (Field Test Mode)
What it does: Opens the service mode menu showing real-time network and radio information.
Information displayed:
- Current cell tower information
- Signal strength (in dBm and ASU)
- Network type (4G, 5G, LTE)
- Band and frequency
- Download/upload speeds
- Neighbor cell towers
- Radio access technology
When to use it:
- Troubleshooting poor signal strength
- Finding the best location for reception
- Checking if 5G is actually connected (vs. showing 5G icon but using LTE)
- Network engineering and optimization
How to exit: Press the back button or menu button, then select “Back” or “Exit”
⚠️ Warning: Do not change any settings in this menu unless you know what you’re doing. Incorrect changes can affect your network connectivity.
13. *#9900# – System Dump Mode (SysDump)
What it does: Accesses the system dump menu for advanced logging and debugging.
Options available:
- Copy dumpstate/logcat logs
- Delete dumpstate/logcat logs
- Low battery dump (debugging battery drain)
- Run dumpstate
- Delete temporary files
When to use it:
- When working with Samsung support to diagnose issues
- For developers debugging apps
- To clear system log files that may be taking up storage space
Caution: Only use “Delete” options if you’re sure you don’t need the logs. These can be valuable for troubleshooting recurring problems.
14. *#*#4636#*#* – Phone Information and Testing Menu
What it does: Opens a comprehensive menu with phone information, usage statistics, and advanced network settings.
Sections available:
Phone Information:
- Current network status
- Signal strength
- Data connection type
- IMEI information
- Network type preference
- Turn off radio option (airplane mode equivalent)
Usage Statistics:
- App usage time
- Last time apps were used
- App battery consumption details
WiFi Information:
- WiFi API settings
- Configuration details
- Status information
When to use it: For detailed network diagnostics, checking data usage, or modifying network preferences.
⚠️ WARNING: This menu contains settings that can affect your phone’s functionality. The “Set Preferred Network Type” option is useful for forcing 4G/5G, but incorrect settings can prevent your phone from connecting to networks.
What NOT to touch:
- Don’t click “Turn off radio” unless you want to disable all wireless connectivity
- Don’t change “Set Preferred Network Type” unless you understand mobile networks
- Don’t modify DNS settings randomly
15. *#232337# – Bluetooth Device Address
What it does: Displays your phone’s unique Bluetooth MAC address.
Information shown:
- Bluetooth MAC address (6 pairs of hexadecimal digits)
- Bluetooth device name
- Bluetooth version (on some models)
When to use it:
- Troubleshooting Bluetooth pairing issues
- Identifying your device in developer tools
- Network administration
16. *#232338# – WiFi MAC Address
What it does: Shows your phone’s WiFi MAC address.
When to use it:
- Setting up MAC address filtering on routers
- Troubleshooting WiFi connection issues
- Network security purposes
17. *#232339# – WiFi Test
What it does: Runs a WiFi connectivity test and shows detailed WiFi status.
Tests performed:
- WiFi chip status
- Connection stability
- Signal strength
- Network information
When to use it: If your WiFi keeps disconnecting or connecting slowly.
Camera & Display Codes
These codes help you test and diagnose issues with your phone’s cameras and display.
18. *#34971539# – Camera Firmware Information
What it does: Displays detailed information about your front and rear camera firmware.
Information shown:
- Camera firmware version
- Camera module manufacturer
- Camera hardware revision
- Sensor information
Options available (varies by model):
- Camera firmware update
- Factory camera test
- Rear/front camera selection
When to use it: If your camera app crashes, produces poor quality photos, or won’t focus properly.
Note: Some newer Galaxy models (particularly S23 and S24 series) may not support this code or may show limited information due to security updates.
19. *#7412365# – Camera Firmware Menu (Alternative)
What it does: Another camera firmware access code that works on some models where *#34971539# doesn’t.
Available on: Primarily Galaxy S series and Note series, though availability varies by model and region.
Network & Connectivity Codes
20. *#0808# – USB Settings and Configuration
What it does: Allows you to change how your phone’s USB connection behaves when connected to a computer.
Options available:
- MTP (Media Transfer Protocol) – for file transfer
- PTP (Picture Transfer Protocol) – for photos only
- RNDIS (for USB tethering)
- MIDI (for music production equipment)
- Charging only
When to use it:
- When your computer doesn’t recognize your phone
- To change default USB behavior
- For developers using ADB (Android Debug Bridge)
Recommended setting: “MTP+ADB” typically provides the best compatibility for file transfer and development.
Note: On some newer Samsung models, this menu may be restricted or relocated to Developer Options.
21. *#7465625# – Phone Lock Status
What it does: Shows the status of various phone locks (SIM lock, network lock, etc.).
Information displayed:
- Network lock status
- Subset lock status
- Service provider lock status
- Corporate lock status
- SIM lock status
When to use it:
- Checking if your phone is carrier-locked
- Before buying a used phone
- When trying to use international SIM cards
Important: This code shows lock status but cannot remove carrier locks. You need to contact your carrier for unlocking.
Advanced & Developer Codes
⚠️ CAUTION ZONE: The following codes can make significant changes to your device. Use them only if you understand what they do.
22. *#197328640# – Service Mode for Network Engineers
What it does: Opens an advanced service mode primarily used by Samsung technicians and network engineers.
Sections available:
- Debug screen
- Phone control
- UE (User Equipment) settings
- UMTS (3G) settings
When to use it: Only if you’re a developer or working with Samsung support. Regular users should avoid this menu.
⚠️ WARNING: Changing settings here can break your phone’s network connectivity. Don’t experiment unless you know what you’re doing.
23. *#9090# – Service Mode Configuration
What it does: Another service mode access point with different options depending on your model.
When to use it: Advanced troubleshooting with Samsung support guidance.
Model variation: Options vary significantly between Samsung models and regions.
24. *#3214789650# – LBS Test Mode (GPS)
What it does: Tests your phone’s GPS and location services.
Tests available:
- GPS signal strength
- Satellite lock status
- Location accuracy
- AGPS (Assisted GPS) status
When to use it: If your GPS is slow to lock, inaccurate, or not working in certain apps.
25. *#32489# – Ciphering Info / Service Mode
What it does: Shows encryption and ciphering information for your network connection.
Information displayed:
- Ciphering status
- Encryption algorithms in use
- Network security information
When to use it: Checking network security or troubleshooting secure connection issues.
⚠️ Dangerous Codes – Use with EXTREME CAUTION
These codes can erase data, reset your phone, or change critical settings. Always backup your data before using any of these codes.
26. *2767*3855# – Full Factory Reset
⚠️ EXTREME WARNING: This code performs an immediate factory reset without any confirmation dialog!
What it does:
- Erases ALL data from your phone instantly
- Removes all apps and settings
- Deletes photos, videos, and files
- Cannot be undone
- Starts immediately when you finish typing the code
DO NOT USE THIS CODE unless:
- You have backed up everything
- You intend to sell or give away your phone
- You’re troubleshooting a serious software issue as a last resort
- You’ve exhausted all other options
Safer alternative: Use Settings > General Management > Reset > Factory Data Reset instead. This gives you a confirmation dialog and more control.
Why this code exists: It’s designed for technicians and developers who need to quickly reset multiple devices. It’s not intended for regular users.
27. *#*#7780#*#* – Factory Data Reset (Alternative)
⚠️ WARNING: Another factory reset code that may or may not show confirmation depending on your model.
What it erases:
- App data
- Settings
- Downloaded apps
What it may keep (model-dependent):
- Photos and media on internal storage
- Data on SD card
Again: Use the Settings menu for factory resets instead of these codes. You’ll have more control and confirmation steps.
28. Low Level Format Option in Test Menu ⛔
⚠️ NEVER USE THIS: Some test menus (*#0*#) include a “Low Level Format” option that can permanently damage your phone’s storage.
What it does:
- Performs a low-level format of internal memory
- Can make your phone unbootable
- May void your warranty
- Can cause permanent hardware damage
There is never a legitimate reason for regular users to use this option. Even technicians rarely need it.
Samsung One UI Hidden Features (No Codes Required)
Beyond secret codes, Samsung’s One UI has many hidden features that most users never discover:
Edge Panels
- Swipe from the edge screen to access quick tools
- Customize with apps, contacts, tasks, clipboard
- Download more panels from Galaxy Store
- How to enable: Settings > Display > Edge Panels
Good Lock (Advanced Customization)
- Samsung’s official app for deep customization
- Change animations, lock screen, task switcher, status bar
- Download: Galaxy Store (search “Good Lock”)
- Modules available: Theme Park, Task Changer, NavStar, QuickStar, LockStar, and more
- Note: Availability varies by region (not available in all countries)
Bixby Routines (Automation)
- Automate tasks based on time, location, or actions
- Example: Turn on Do Not Disturb at bedtime automatically
- Example: Mute phone when arriving at work
- Example: Turn on WiFi when you get home
- Access: Settings > Advanced Features > Bixby Routines
Secure Folder
- Hidden encrypted space for private apps and files
- Separate login from main phone
- Can clone apps (two WhatsApp accounts, etc.)
- Enable: Settings > Security and Privacy > Secure Folder
App Continuity
- Apps resume on external display or DeX mode
- Seamless transition between phone and monitor
- Enable: Settings > Advanced Features > Labs > App Continuity
Multi-Window Improvements
- Pop-up view for any app (recent apps > tap app icon > Open in pop-up view)
- Split screen with adjustable divider
- How to use: Recent apps > Tap app icon > Open in split screen
Model-Specific Codes
Some codes work differently or provide additional options on specific Samsung models:
Galaxy S Series (S24, S23, S22, S21, S20)
- Most codes listed above work correctly
*#0*#has additional sensor tests for newer hardware- 5G testing options in
*#0011# - Some camera codes may be restricted on newer models for security
Galaxy Note Series
- All standard codes work
- S Pen testing available in
*#0*#test mode - Additional productivity features accessible through codes
Galaxy A Series (Budget Models)
- Most diagnostic codes work
- Some advanced codes may be limited or unavailable
- Hardware test options may vary based on model tier
- Fewer sensors means some tests won’t appear
Galaxy Z Fold/Flip (Foldables)
- Standard codes work on both screens
- Additional hinge tests may appear in
*#0*# - Dual-screen calibration options on some models
- Some codes behave differently due to unique hardware
Older Models (Galaxy S10 and earlier)
- All basic codes work
- Some newer codes may not be available
- Test mode layout may look different
- Some camera and 5G codes won’t exist (hardware limitation)
Regional Variations
- Some codes are carrier-blocked (especially in US)
- International models typically have more code availability
- Asian and European models may have different options
- Factory unlocked phones have fewer restrictions
Troubleshooting: When Codes Don’t Work
Code does nothing when typed:
- Verify you’re using the Phone/Dialer app, not Contacts
- Type the code exactly as shown (asterisks and hashes matter)
- Try typing it more slowly
- Restart your phone and try again
- Some codes are region or carrier-specific and may be blocked
Code shows “Connection problem or invalid MMI code”:
- This typically means the code isn’t supported on your specific device model
- Try alternative codes for the same function (if available)
- Your carrier may have blocked certain codes
- Try switching to WiFi calling and attempt again
- Update your phone’s software to the latest version
Test mode won’t exit:
- Press the back button multiple times
- Press the home button to return to home screen
- If completely stuck, force restart: Hold Power + Volume Down for 10 seconds
Phone freezes after entering code:
- Wait 30-60 seconds for the process to complete
- If still frozen after 1 minute, force restart (Power + Volume Down for 10 seconds)
- This is rare but can happen on older devices with low memory
Code works but shows errors or incomplete information:
- The feature may not be fully supported on your specific model
- Software may need updating
- Some features are firmware version-dependent
- Contact Samsung support with the error message if critical
Different results than described:
- Model variation is normal—codes behave differently across models
- One UI version affects menu layouts and available options
- Carrier customization can modify or hide features
- Regional firmware differences affect code availability
Safety Tips and Best Practices
Before Using Any Code: ✅ Read the description carefully to understand what it does ✅ Understand the potential outcomes and risks ✅ Backup important data before using reset or factory codes ✅ Ensure your battery is above 50% (for codes that run processes) ✅ Don’t use codes while on important calls or during critical tasks
General Safety Rules: ✅ Never use factory reset codes unless absolutely necessary ✅ Don’t experiment with service mode settings randomly ✅ Take screenshots of original settings before changing anything ✅ Exit menus properly using back button, not force-closing ✅ If unsure about a code, don’t use it—ask first or research more
When to Contact Samsung Support Instead:
- Hardware issues requiring physical repair
- Warranty-related problems
- Software glitches after failed code attempts
- Network issues that codes can’t resolve
- Before using any code you don’t fully understand
- If a code causes unexpected behavior
Warranty Considerations:
- Diagnostic and information codes won’t void warranty
- Factory reset codes are safe and legitimate Samsung features
- Service mode modifications might complicate warranty claims
- Never use codes that flash firmware or modify system partitions
- Document any issues that existed before using codes
Privacy & Security:
- These codes access system functions, not personal data
- No sensitive information is transmitted when using codes
- Codes work entirely on your device (offline capability)
- However, be cautious about who sees the information displayed
- Don’t share IMEI numbers or device-specific information publicly
Frequently Asked Questions
Q: Are Samsung secret codes safe to use? A: Most diagnostic and information codes are completely safe. They just display information or run tests without making changes. However, avoid factory reset codes and service mode settings unless you know what you’re doing. Always read the description and warnings before using any code.
Q: Will these codes void my warranty? A: No. Using diagnostic codes and test menus will not void your Samsung warranty. These are built-in features provided by Samsung. However, if you use service mode to modify radio settings and cause problems, Samsung may not cover it under warranty. Stick to the safe, informational codes.
Q: Why don’t some codes work on my Samsung phone? A: Code availability depends on your phone model, region, carrier, and firmware version. Some carriers block certain codes for security reasons. Budget models (Galaxy A series) may have fewer codes available than flagship models. Additionally, newer models sometimes restrict certain codes that were available on older devices.
Q: Can I damage my phone with these codes? A: Diagnostic and test codes are harmless. Information codes just display data. The only codes that can cause issues are factory reset codes (which erase data) and advanced service mode settings (if modified incorrectly). As long as you stick to the codes marked as safe in this guide and avoid the “dangerous” section, you won’t damage your phone.
Q: Do these codes work on all Samsung Galaxy models? A: Most codes work across Galaxy S, Note, A, and Z series phones. However, availability varies by model year, region, and carrier. Newer models (2023-2025) support most codes, while very old models (pre-2018) may have different codes or limited functionality. Flagship models generally have more code availability than budget models.
Q: What’s the difference between *#0*# and *#7353#? A: Both are test modes, but *#0*# offers a comprehensive visual menu with individual test buttons for nearly every hardware component, while *#7353# provides a simpler quick-test menu with fewer options. Use *#0*# for thorough testing and *#7353# for quick checks. *#7353# is also more likely to work on older or budget Samsung models.
Q: Can I use these codes to unlock my carrier-locked phone? A: No. Secret codes can show you if your phone is locked (using *#7465625#) but cannot remove carrier locks. You need to contact your carrier for unlocking or use legitimate third-party unlocking services. There is no secret code that bypasses carrier locks.
Q: Will using these codes affect my data or apps? A: No, with the exception of factory reset codes. All other codes are non-destructive—they only display information or run tests. Your apps, photos, and data remain completely untouched when using diagnostic and information codes.
Q: How do I exit test mode if I’m stuck? A: Press the back button multiple times, or press the home button to return to your home screen. If your phone is completely frozen (rare), force restart by holding Power + Volume Down together for 10 seconds. Your phone will reboot and return to normal.
Q: Are there any Samsung secret codes for free stuff or unlocking paid features? A: No. These codes don’t unlock premium features, give you free services, or bypass payment systems. They’re strictly for diagnostics, testing, and information. Beware of websites claiming otherwise—those are scams.
Q: Can these codes fix software problems? A: They can help diagnose problems by identifying which hardware component is failing, but they don’t directly fix software issues. For software problems, try clearing cache, updating software, or performing a factory reset through Settings (not via code). Codes are diagnostic tools, not repair tools.
Q: Why does my phone say “Connection problem or invalid MMI code”? A: This error message means the code either isn’t supported on your device, has been blocked by your carrier, or was typed incorrectly. Double-check the code, try connecting to WiFi calling if available, or try alternative codes for the same function. Some codes simply aren’t available on all models.
Q: Do I need to enable Developer Options to use these codes? A: No. Secret codes work without Developer Options enabled. They’re built into the Phone app and accessible to all users. Developer Options is a separate feature that provides additional settings but isn’t required for diagnostic codes.
Q: Can I see my battery cycle count with these codes? A: On some Samsung models, *#0228# shows battery cycle count, but this varies by device and firmware. Many newer Samsung models have removed cycle count from this menu. If not shown, third-party apps like AccuBattery can estimate cycle count based on usage patterns.
Q: Will these codes work after a factory reset? A: Yes. Secret codes are built into the firmware and remain available even after factory resets. They’re part of the Android system and cannot be removed or disabled by users.
Conclusion
Samsung secret codes are powerful tools that give you unprecedented access to your phone’s hidden features, diagnostic capabilities, and system information. From checking battery health to testing every hardware component, these codes transform your Galaxy phone into a technician’s diagnostic tool.
The Most Useful Codes to Remember:
*#0*#– Complete hardware test menu (essential for diagnosing issues)*#0228#– Battery health check (monitor battery condition)*#06#– IMEI number (critical for lost/stolen phones)*#1234#– Software version info (check for updates)*#0011#– Network signal testing (troubleshoot connectivity)
Key Takeaways: ✅ Most codes are safe for regular users ✅ Diagnostic codes help identify hardware problems before paying for repairs ✅ Information codes provide detailed device specifications ✅ Always backup before using reset codes ✅ Avoid service mode settings unless you’re experienced ✅ Bookmark this guide for future reference
Important Reminders:
- Code availability varies by model, region, and carrier
- Not all codes work on all Samsung devices
- Always read warnings before using unfamiliar codes
- When in doubt, stick to the safe diagnostic and information codes
- Contact Samsung support for serious hardware or software issues
Whether you’re troubleshooting issues, buying a used Samsung phone, or just curious about your device’s capabilities, these secret codes give you the power to understand and control your Samsung Galaxy like never before.
Have you discovered any issues or features using these codes? Share your experience in the comments below!
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Author Note: This guide was researched and tested across multiple Samsung Galaxy devices from December 2024 to January 2025. While we strive for accuracy, Samsung may change code functionality in future updates. Always test codes carefully and report any issues or changes in the comments.
Last Updated: January 2025 | Tested on Galaxy S24, S23, S22, A54, and Z Fold 5 | Firmware: One UI 6.0 and 6.1
Disclaimer: Use these codes at your own risk. While most codes are safe, some can reset your device or change critical settings. Always backup your data before using any code marked with a warning. SkillToSky.com is not responsible for any damage or data loss resulting from the use of these codes.
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💬 Your Turn: Which Samsung secret code surprised you the most? Have you used any of these to diagnose a problem? Drop a comment below and share your experience!