All Samsung Secret Codes List 2026 – Test Mode, Battery Status, and Hardware Diagnostics
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| Figure 1: The hidden Hardware Diagnostic Menu (Test Mode) on Samsung Galaxy devices. |
In the intricate ecosystem of Android smartphones, Samsung Galaxy devices are equipped with a hidden layer of diagnostic tools known as USSD (Unstructured Supplementary Service Data) codes. These secret menus are not accessible via the standard Settings app but are indispensable for mobile technicians, software engineers, and smart buyers in the second-hand market.
Whether you are troubleshooting a "Ghost Touch" issue, verifying the authenticity of a used phone, or configuring USB settings for FRP Bypass, mastering these codes in 2026 is mandatory. In this comprehensive guide, we decode the most critical Samsung secret codes that every technician must know.
1. The "Holy Grail" of Diagnostics: *#0*#
This is arguably the most powerful code in the Samsung ecosystem. Known as the General Test Mode, it allows you to test every hardware component individually without third-party apps.
What specifically should you test?
- Red / Green / Blue: Displays full-screen solid colors to check for dead pixels or screen burn-in (common in OLED panels).
- Receiver & Speaker: Emits a high-pitch sound to verify audio output clarity.
- Touch: Opens a grid. You must draw a line through all boxes. If a box doesn't turn green, that area of the digitizer is dead.
- Sensor: Displays raw data from the Accelerometer, Gyroscope, and Magnetic sensors.
- Grip Sensor: Tests if the phone detects when you are holding it (crucial for antenna signal optimization).
2. Firmware & Software Verification: *#1234#
When flashing a device using the Odin Flash Tool, matching the binary version is critical. This code reveals the three core software components:
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| Figure 2: Verifying the AP, CP, and CSC binaries using the *#1234# command. |
| Component | Description |
|---|---|
| AP (System) | The main Android OS and System partition. |
| CP (Modem) | Controls the Radio, Wi-Fi, and Bluetooth (Core Processor). |
| CSC (Consumer) | Country Specific Code. Defines region-specific features (e.g., Samsung Pay, VoLTE). |
3. Battery Calibration & Status: *#0228#
Does your Samsung phone drop from 40% to 15% instantly? This indicates a "Fuel Gauge" error. The *#0228# code opens the BatteryStatus menu.
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| Figure 3: The 'Quick Start' button resets the battery stats logic. |
By clicking "Quick Start", you force the phone to re-read the actual voltage from the battery cells. This is a standard procedure for technicians after replacing an old battery.
4. Advanced Developer Codes (2026 List)
These codes are used for deep-level system configuration and cleaning.
System Dump Mode: *#9900#
If your phone says "Storage Full" but you don't have many photos, dial this. Select "Delete Dumpstate/logcat". This clears temporary system logs that can occupy gigabytes of space silently.
USB Settings: *#0808#
This is crucial for USB Connectivity. If your PC isn't detecting the phone, dial this and select "DM + Modem + ADB". This mode is mandatory for using tools like Octoplus or Z3X.
IMEI Verification: *#06#
The universal code to display your International Mobile Equipment Identity. Always match this with the box and the back panel sticker to ensure the device housing hasn't been changed.
*#9090# (Service Mode) and *#2663# (Firmware Update) modify the kernel parameters. Do not execute these unless you are a trained professional, as incorrect settings can result in a network failure (No Service).
Why Do Some Codes Fail?
If you dial a code and nothing happens, it is likely due to one of two reasons:
- Carrier Restrictions: US carriers like Verizon and AT&T often disable USSD codes. In this case, you must use the "SamFw Tool" to enable Test Mode via ADB.
- Tablet Restrictions: Some Wi-Fi-only tablets do not have a dialer app, making these codes inaccessible without a workaround app like "Activity Launcher."
Conclusion
Samsung's secret codes are a bridge between the user and the hardware engineer. Whether you are calibrating a battery or checking a Super AMOLED display for defects, these tools are invaluable. Bookmark this page for your future repair needs.
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