If you’ve ever wanted to dig deeper into your Samsung smartphone and access hidden settings, Samsung secret codes are your key. These are special USSD and MMI codes that help you check IMEI, test hardware, run network diagnostics, and unlock system-level features – all directly from your phone’s dialer. (Speaking of dialer codes, if you want free data, check out our working Airtel free data USSD codes).
In this guide, we’ll list all working Samsung secret codes for One UI (2026) and explain what each one does.
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What Are Samsung Secret Codes?
Samsung, like other Android manufacturers, includes built-in diagnostic and service codes for system testing. These codes, entered through the dialer, allow technicians and users to:
- Check IMEI and firmware info
- Test display, sensors, and hardware
- Access engineering and service modes
- Perform network and connectivity checks
- Reset or reconfigure key system settings
These codes are officially known as MMI (Man-Machine Interface) and USSD (Unstructured Supplementary Service Data) codes.
Tip
Before using any secret code, ensure you’ve backed up your data. Some codes may reset your device or change configuration settings.
Working Samsung Secret Codes for One UI (2025)
Here’s a verified list of working secret codes for Samsung Galaxy smartphones running the latest One UI version (including Galaxy S, A, M, and F series).
| Code | Function |
|---|---|
| *#06# | Check IMEI, MEID, & Serial Number |
| *#07# | Check SAR Level |
| #0# | Samsung Hardware Diagnostic Test Menu |
| *#1234# | Check AP, CP, CSC Version, & Model Number |
| *#0808# | Access Samsung USB Settings |
| *#2683662# | Access Samsung Service Mode |
| *#0011# | Display SIM Information |
| *#1111# | Check FTA Software Version |
| *#2222# | Check FTA Hardware Revision Version |
| *#9090# | Check Diagnostic Configuration |
| *#9900# | Access Samsung SysDump Mode |
| #272IMEI# | Change the CSC of Samsung Devices |
| #12580369# | Check Software and Hardware Information |
| *#0283# | Check the Audio Loopback Control |
| *#34971539# | Check Camera Status and Firmware Version |
| *#2663# | Check and Update Touchscreen Panel Firmware |
| ##7780## | Reset or Format Your Device |
| *#22558463# | Reset Total Call Time |
| *135# (dial) | Request Your Own Phone Number |
| 04[old Pin][new Pin]*[new Pin]# | Change SIM Card PIN |
| *#73# | Access Service Mode on VZW and AT&T Devices |
Samsung Engineering Mode Explained
Engineering mode gives advanced access to test and debug various hardware components such as display, camera, sensors, and connectivity.
To open it, dial:
*#0*#
This will open a white diagnostic screen where you can test:
- Red, green, and blue color calibration
- Speaker and vibration test
- Touch responsiveness
- Camera and sensor performance
USSD vs MMI Codes – What’s the Difference?
Though often used interchangeably, they serve slightly different roles:
| Type | Full Form | Function |
|---|---|---|
| USSD Codes | Unstructured Supplementary Service Data | Used for network and SIM-related operations. |
| MMI Codes | Man-Machine Interface | Used to access internal phone functions and hardware diagnostics. |
Example:
- USSD:
*135#(shows your mobile number) - MMI:
*#0*#(opens hardware test mode)
Important Notes Before Using These Codes
- Some codes may not work on locked carrier phones.
- Dual SIM variants may show partial functionality.
- Avoid factory reset or CSC change codes unless you know what you’re doing.
- Always backup important data before experimenting.
- Open your Samsung phone dialer.
- Enter the secret code exactly as listed.
- Wait a few seconds for the menu or result to appear.
- If nothing happens, the code may not be supported on your model or region.
Samsung Secret Codes PDF Download
For offline use, you can download the complete Samsung secret codes list in PDF format, including One UI, Android 14, and 15 compatibility.
Quick Recap
- Secret codes unlock hidden diagnostic menus on Samsung phones.
- You can test, repair, and configure system features directly via dialer.
- Avoid using reset or CSC change codes unless necessary.
- These codes are tested and safe for most Samsung Galaxy devices.
FAQs About Samsung Secret Codes
Frequently Asked Questions
What are Samsung secret codes?
Do Samsung secret codes work on all devices?
Is it safe to use Samsung secret codes?
How can I open Samsung engineering mode?
What is the difference between USSD and MMI codes?
Why are some secret codes not working on my phone?
Can Samsung secret codes reset my phone?
Do Samsung secret codes work on tablets?
Can I use Samsung secret codes on other Android phones?
Where can I get the full Samsung secret codes list in PDF?
Samsung secret codes are a powerful way to explore and manage your device beyond what regular settings allow. Whether you’re diagnosing an issue or exploring hidden features, this list gives you full control – just remember to handle advanced codes carefully.