Android Secret Codes — Complete List 2026
For mobile repair technicians, hardware engineers, and advanced enthusiasts, secret codes bypass high-level Android UI layers, granting direct access to onboard sensors, radio transceivers, battery management ICs, and chipsets (MediaTek, Qualcomm, Exynos, Spreadtrum).
This master reference guide from SKILVO organizes universal dialer codes, OEM-specific engineering protocols, diagnostic command blocks, and danger alerts for modern smartphones.
📊 Technical Execution & Command Architecture
User Enters Code ➔ Telephony Stack Intercepts MMI/USSD ➔ OS Invokes SecretCodeReceiver ➔ Kernel Engineering Menu Launches
|
Brand / Processor |
Primary Engineering Code |
Execution Layer |
Target Diagnostic Component |
|---|---|---|---|
|
Universal Android |
*#06# / *#*#4636#*#* |
System Telephony |
IMEI / Radio / Network / Battery |
|
Samsung Galaxy |
*#0*# / *#0228# |
Factory Test Kernel |
Display, Touch Matrix, Fuel Gauge IC |
|
MediaTek (MTK) |
*#*#3646633#*#* |
EngineerMode Service |
Baseband Bands, Audio Gain, Touch |
|
Xiaomi (MIUI/HyperOS) |
*#*#64663#*#* |
Hardware Test (CIT) |
Gyroscope, Proximity, Camera, Audio |
|
Qualcomm Devices |
*#*#6484#*#* |
QC Test Interface |
Modem Registers, Board Calibration |
🛠️ How to Execute Secret Codes Correctly
- Open the native Phone / Dialer App on your device.
- Enter the target sequence carefully including all asterisk (*) and hash (#) symbols.
- Execution Trigger: Most diagnostic strings automatically launch their target menu the instant the last symbol is pressed without pressing the call button.
- If a code fails to launch, your network provider or custom vendor skin (e.g., One UI, MIUI, HiOS) may have disabled that specific broadcast receiver.
🌍 Universal Android Secret Codes (All Brands)
These fundamental commands operate across the majority of Android software builds:
1. Device Identification & Baseband Info
- Function: Displays the International Mobile Equipment Identity (IMEI), SV (Software Version), and Serial Numbers.
- Technician Use: Essential for verifying physical board identity against chassis numbers, blacklisting checks, and registration verification.
2. Deep Telephony & Radio Information
- Function: Opens the core Android testing framework.
-
Available Modules:
- Phone Information: View signal strength in dBm, force network modes (e.g., LTE Only, NR/LTE), run ping tests, and check SMSC addresses.
- Usage Statistics: Displays exact app launch timestamps and duration.
- Wi-Fi Information: Wi-Fi API status and configuration logs.
3. Display Calibration & Sensor Diagnostic Strings
📱 OEM-Specific Secret Code Libraries
1. Samsung Galaxy (One UI Diagnostic Suite)
Samsung includes some of the most comprehensive diagnostic frameworks available in mobile servicing:
Pro Tip: Use *#0228# after replacing a Samsung battery to check the actual analog-to-digital converter (ADC) readout and verify charge voltage consistency.
2. MediaTek (MTK) Engineering Mode (Tecno, Infinix, Itel, RealMe)
MediaTek chipsets use a specialized engineering overlay:
-
Sub-Menu Features:
- Telephony: Lock specific LTE/3G network bands (Band Locking) to fix fluctuating signal issues.
- Audio: Adjust maximum earpiece, speaker, and microphone gain parameters.
- Hardware Testing: Calibrate touchscreens, proximity sensors, and accelerometers after screen replacements.
3. Xiaomi (MIUI / HyperOS Hardware Test - CIT)
- Function: Comprehensive 30+ step automated test protocol covering dual speakers, display uniformity, fingerprint sensor optical calibration, and charging ICs.
4. Huawei, Oppo, Vivo & Realme
⚡ Technical Service Workflows for Technicians
When testing repaired hardware on the bench, follow these standard command sequences:
Scenario A: Post-Screen Replacement Verification
- Dial *#06# to confirm board communication.
- Dial *#0*# (Samsung) or *#*#64663#*#* (Xiaomi) / *#*#2664#*#* (Universal).
- Execute the Touch Matrix Test by drawing along every grid line to confirm no dead spots exist on the new digitizer.
- Execute the RGB Screen Test to verify there are no backlight bleeds, dead pixels, or tint anomalies.
Scenario B: Resolving Low 4G Signal / Network Drops
- Dial *#*#4636#*#*.
- Select Phone Information.
- Under Set Preferred Network Type, change the default setting to NR/LTE or LTE Only to force high-speed bands and prevent drops to 2G/3G.
⚠️ High-Risk Codes to Handle with Caution
The following strings bypass confirmation dialogs and perform destructive storage operations immediately upon input:
⚠️ Warning: Never enter *2767*3855# unless you intend to completely erase all internal storage, user partitions, and structural directories.
Conclusion
Android Secret Codes are essential diagnostic tools for mobile hardware servicing. Mastering these USSD and MMI sequences allows technicians and advanced users to troubleshoot faults rapidly, verify repair quality, and optimize system performance.
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