How To Use Secret Codes On Tecno Spark 20 |verified| Jun 2026
| Test | Code | What It Does | | :--- | :--- | :--- | | | *#0*# | Cycles through RGB (Red, Green, Blue) screens to check for dead pixels. | | Touch Screen Test | *#*#2664#*#* | Draw lines on the screen to verify multi-touch accuracy. | | Speaker & Mic Test | *#*#0673#*#* | Plays audio through the earpiece and loudspeaker. | | Proximity Sensor Test | *#*#0588#*#* | Covers/uncovers the top sensor to see if the screen blacks out correctly. | | Vibration Test | *#*#0842#*#* | Makes the phone vibrate to check the haptic motor. | | Camera Test | *#*#34971539#*#* | Opens camera firmware information and allows you to test rear/front cameras. |
: A comprehensive hardware diagnostic suite to test the screen, speakers, and sensors. *#*#2664#*#* Touch-Screen Test : Specifically tests the responsiveness of your display. *#*#0289#*#* Audio/Melody Test : Verifies that your speakers and microphone are working. *#*#0842#*#* Vibration & Backlight : Tests the vibration motor and screen brightness controls. *#*#232338#*#* Wi-Fi MAC Address : Instantly shows your phone's hardware address for Wi-Fi. Advanced Developer Mode How to Use Secret Codes on TECNO Spark 20
If *#*#4636#*#* fails, try *#*#7378423#*#* (Sony code, but works on many MediaTek phones like the Spark 20). | Test | Code | What It Does
: Instantly displays your device's unique 15-digit International Mobile Equipment Identity (IMEI) and serial number. This is vital for Warranty Checks and reporting lost devices. | | Proximity Sensor Test | *#*#0588#*#* |
: Launches a comprehensive diagnostic suite to test the LCD, vibration motor, speakers, OTG, and Bluetooth.