Secret codes are available on smartphones and these secret codes, which allow you to access hidden places in the phone using the dialer, are often used by engineers for device repair. With these secret codes, you can access all the features of the phone.

In addition to the secret codes commonly used by Android phones, Samsung is the secret code of some manufacturers' smartphones such as HTC, LG, Sony, Motorola and Oppo

1. General Android Codes

• * # 4636 # * # * About Phone, Battery, Display info, and Usage statistics

• * # 7780 # * # * Factory reset of your phone - only deletes application data and applications

• 2767 * 3855 # This code makes a complete delete, at the same time reloads the phones

• * # 34971539 # * # * Show information about the camera

• * # 7594 # * # * Change power button behavior

• * # 273.283 * 255 * 663.282 * # * # * Fast backup of all media files

• * # 197328640 # * # * Enable for test mode service activity

• * # 232339 # * # * OR * # * # 526 # * # * Wireless LAN Tests

• * # 232.338 # * # * Displays Wi-Fi, Mac address

• * # 1472365 # * # * For quick GPS test

• * # 1575 # * # * Different type of GPS test

• * # 0283 # * # * Package loopback test

• * # 0 * # * # * LCD screen test

• * # 0673 # * # * OR * # * # 0289 # * # * Sound test

• * # 0842 # * # * Vibration and Backlight test

• * # 2663 # * # * Touchscreen version displays

• * # 2664 # * # * Touch Screen test

• * # 0588 # * # * Proximity sensor test

• * # 3264 # * # * Ram version

• * # 232331 # * # * Bluetooth test

• * # 7262626 # * # * Field test

• * # 232337 # * # * Displays the Bluetooth device address

• * # 8255 # * # * To watch the Google Talk service

• * # 4986 * 2650468 # * # * PDA, Phone, Hardware, RF Call Date firmware information

• * # 1234 # * # * PDA and Phone firmware information

• * # 1111 # * # * FTA Software version

• * # 2222 # * # * FTA Hardware version

• 06 # IMEI number

• * # 8351 # * # * Provides voice dialing mode

• * # 8350 # * # * Disable voice dialing mode

1. Oppo ColorOS Devices

800 # - Enter engineering mode

• 801 # - Engineering key test mode (dangerous)

• 802 # - Automated engineering to enter TTFF GPS test mode

• 803 # - Engineering network to enter the test mode

• 804 # - Automatic disconnect test mode

• 805 # - Engineering Bluetooth test mode

• 806 # - Engineering aging test mode

• 807 # - Enter engineering test mode

• 808 # - Manual engineering test mode

• 809 # - Enter engineering echo test mode

• 888 # - Hardware pcb version view

• 900 # - RGB photo test

• 06 # - Mobile communication, seeing international recognition ID

• 99 # - Display lights long bright

• 6776 # - Device info

• 1234 # - Display software details

• 36446337 # - Test function instruction

1. Samsung Android Secret Codes

• * # 4636 # * # * About usage statistics for phone, battery, and screen information

• * # 7780 # * # * Factory reset of your phone - only deletes application data and applications

• 2767 * 3855 # This code makes a complete delete and reloads the firmware to mobile phones

• * # 34971539 # * # * Shows information about the camera

• * # 7594 # * # * Change power button behavior

• * # 273283 * 255 * 663.282 * # * # * Backs up all media files quickly

• * # 197328640 # * # * Enable test mode for service activity

• * # 232339 # * # * OR * # * # 526 # * # * Wireless LAN Tests

• * # 232.338 # * # * Displays Wi-Fi, Mac address

• * # 1472365 # * # * For quick GPS test

• * # 1575 # * # * Different type of GPS test

• * # 0283 # * # * Package loopback test

• * # 0 * # * # * LCD screen test

• * # 0673 # * # * OR * # * # 0289 # * # * Sound test

• * # 0842 # * # * Vibration and Backlight test

• * # 2663 # * # # * touch screen version displays

• * # 2664 # * # * Touch Screen test

• * # 0588 # * # * Proximity sensor test

• * # 3264 # * # * Ram version

• * # 232331 # * # * Bluetooth test

• * # 7262626 # * # * Field test

• * # 232337 # * # Displays the Bluetooth device address

• * # 8255 # * # * For Google Talk service tracking

• * # 4986 * 2650468 # * # * PDA, Phone, Hardware, RF Call Date firmware information

• * # 1234 # * # * PDA and Phone firmware information

• * # 1111 # * # * FTA Software version

• * # 2222 # * # * FTA Hardware verion

• 06 # IMEI number

• * # 8351 # * # * Voice call logging mode

• * # 8350 # * # * Disable voice call log mode

778 (+ call) brings the epST menu

1. HTC Android Devices Codes

• * # 3424 # * # * HTC function test program.

• * # 4636 # * # * HTC Info menu

• * # 8255 # * # # * Start GTalk Service Monitor