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

Here’s a clear, safe write-up on how to use secret codes on a Samsung Galaxy A7 (2016/2018) — often referred to as the “A7 2” in some regions (second generation of the A series).

Important note: These codes are for diagnostic and informational purposes. Misuse can affect device functionality. Proceed at your own risk.

1. Hardware Diagnostic & Test Mode

Code: *#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.

Advanced: Unlocking Hidden Service Mode with `*#0011#` Menu

The most powerful secret code on the Galaxy A7 is *#0011#. Once inside, you can access deeper menus: how+to+use+secret+codes+on+samsung+galaxy+a7+2+work

Dial *#0011#.
Press the three-dot menu (top right) and select "Back" (this is counterintuitive but opens the main service menu).
Tap "Key Input" and enter Q (capital Q), then 0000 (four zeros).
You now have access to Network Lock, NV Rebuild, and Band Selection.

Band Selection lets you force your phone to use 4G LTE bands only (useful if you’re in a weak signal area). But be careful—changing the wrong setting can break cellular connectivity until a factory reset.

4. Diagnostic Configuration

Code: *#9090#
Function: Opens Diagnostic Configuration.
Use Case: This is mostly used for logging system errors. It allows you to enable or disable specific logs (like Bluetooth or Wi-Fi logs) to help developers or support teams diagnose software bugs.

How to Properly Enter Secret Codes on the Galaxy A7

Before diving into the list, follow these critical steps to ensure codes work:

Step 1: Open the stock Phone dialer app (Samsung’s default green phone icon). Third-party dialers like Google Dialer often block secret codes. Here’s a clear, safe write-up on how to

Step 2: Type the code exactly as shown, including all *, #, and numbers. Do not press the call button unless instructed.

Step 3: Most codes launch automatically as soon as you type the final character (usually #). If nothing happens, press the green Call button once.

Step 4: If the screen flashes and nothing appears, the code is either blocked or unsupported on your specific firmware version. Dial *#0011#

Pro Tip: Turn off Wi-Fi Calling and VoLTE temporarily. Some carriers redirect USSD codes through their servers, breaking local secret codes.

Unlocking Hidden Features: A Guide to Secret Codes on the Samsung Galaxy A7

The Samsung Galaxy A7 (2018) is a capable mid-range device known for its triple-camera setup and Super AMOLED display. However, beneath the standard One UI or Samsung Experience interface lies a hidden layer of software known as "Service Mode." This hidden layer is accessed via secret codes (also known as USSD codes or dialer codes).

Whether you are a technician troubleshooting a device or a power user wanting to verify hardware integrity, these codes provide shortcuts to vital diagnostic tools.

Note: Please proceed with caution. Some codes access settings that can alter system behavior or delete data (like a factory reset). It is recommended to back up your data before experimenting.

2. General Hardware Tests (Service Menu)

Code: *#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."