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This is the most famous code on any mobile phone.
, which provides detailed statistics on battery health, Wi-Fi status, and cellular usage. *#*#426#*#* : Launches FCM Diagnostics
and serial number, essential for tracking or identifying your device. : Provides General Information , including RAM/ROM size and product name. Diagnostics and Testing: : Opens the Factory Test / Engineering Mode
: Most codes will execute automatically as soon as the last character is typed. If nothing happens, you may need to tap the Call button. Essential VIVO V40 Secret Codes List