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This code opens the Diagnostic Mode menu, which provides information about your device's hardware and software. You can access various tests, such as:

Some carriers (especially in the US like Verizon) disable specific diagnostic codes by default. Dialer App: These codes often only work in the original Samsung Phone app , not third-party dialers from the Play Store. Safe Usage Tips Information Only: Use codes like freely for device specs. Avoid Settings Changes: In menus like Service Mode how+to+use+secret+codes+on+samsung+galaxy+a7+2+work

*#0*# Action: Launches the LCD Test Menu . What you can do: Test your screen colors (red, green, blue), touch sensitivity, vibration, backlight, camera, and sensors (gyroscope, proximity). Exit: Press the back key or the "Exit" button on screen. Note: This is arguably the most useful code for the Galaxy A7. No call button needed—it opens instantly. This code opens the Diagnostic Mode menu, which

How to Use Secret Codes on Samsung Galaxy A7 (2017 & 2018) to Work Safe Usage Tips Information Only: Use codes like

Provides detailed information about your current cellular network connection, including serving cell info.

That evening she organized what she’d learned into a short list on her phone:

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