How+to+use+secret+codes+on+samsung+galaxy+a7+2+work -

Provides in-depth network diagnostics and phone usage stats.

To use secret codes on the Samsung Galaxy A7 , you typically enter specific alphanumeric sequences into the phone's default Phone/Dialer app how+to+use+secret+codes+on+samsung+galaxy+a7+2+work

Secret codes (USSD/MMI codes) are keypad entries that launch hidden menus for testing hardware, checking device stats, or resetting certain settings. Provides in-depth network diagnostics and phone usage stats

If the screen flashes and nothing appears, the code is either blocked or unsupported on your specific firmware version. This is the most useful code

This is the most useful code. It opens a white menu screen allowing you to test individual components of your Galaxy A7, including the screen (colors), vibration, camera, sensors (accelerometer, proximity), touch functionality, and speakers.

Type the secret code, which typically starts with a * or # and ends with # .

*#26833662# – : Deep engineer settings allowing manual modifications to 2G, 3G, and LTE baseband bands.