Curious about his camera’s firmware, he typed *#*#34971539#*#* . That opened a camera information panel showing sensor details. Helpful for verifying if he had genuine components.
But Leo remembered a warning from a tech forum: some codes can reset your phone or erase data. He avoided *2767*3855# (full factory reset) and *#*#7780#*#* (factory data reset without clearing photos). Those were dangerous if mistyped. How to Use Secret Codes on TECNO Camon 19
He also learned that not all codes work on every TECNO Camon 19—HiOS (TECNO’s custom Android skin) might block or alter some. So he tested carefully and never shared his IMEI publicly. But Leo remembered a warning from a tech
That night, Leo fixed a minor screen calibration issue using *#*#3424#*#* (HTC function test, which sometimes worked on TECNO for sensors). He felt like a pro. He also learned that not all codes work
He opened the Phone dialer app—the same one he used for regular calls—and carefully typed *#*#4636#*#* . Instantly, a hidden “Testing” menu appeared. It showed battery stats, usage history, and Wi-Fi details. “Whoa,” Leo whispered. He didn’t change anything, just noted his battery health was good.
Next, he tried *#*#0#*#* . A full LCD test screen popped up, cycling through red, green, and blue. He used it to check for dead pixels on his display. No issues.