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These codes are frequently used for diagnostics and retrieving device information:

*#7353# Action: Opens a simpler self-test interface. What you can do: Test speaker, receiver, microphone, vibration motor, and the IR LED (if your A7 variant has it). Exit: Press "Back" or "Finish." how+to+use+secret+codes+on+samsung+galaxy+a7+2+work

If you suspect your phone has a hardware fault, this is the most important code to know. These codes are frequently used for diagnostics and

*#0228# Action: Displays detailed battery information. Data shown: Voltage, temperature, battery level percentage (raw), and charge/discharge cycles. Warning: Do not press the "Quick Start" button unless you want to calibrate the battery (this can cause temporary voltage drops). Just read the data and press "Back." battery level percentage (raw)