Does the *#0*# code work on all Samsung phones?

It works on the vast majority of Samsung Galaxy devices. However, the menu may look different or have fewer options on certain tablets or carrier-locked models.

Why does the "Touch" test turn the screen into colors?

This test is designed to verify that all screen pixels are working. Once you color in all the squares, the phone automatically exits the test. If it doesn't exit, that indicates an area that is not responding to touch.

What is the difference between the Service Code and the Samsung Members app?

The Service Code provides direct, low-level hardware tests (like testing speakers), while the Samsung Members app offers software diagnostics and reports on battery health and system status.

Can I test the fingerprint sensor using these codes?

Yes. In the *#0*# test menu, you will often find an option labeled Sensor. From there, you can perform a Fingerprint Test to ensure the scanner is functioning.

If one of the tests fails, does it mean the phone is broken?

Not necessarily. Some tests may fail due to software bugs. Try restarting your phone and updating your software first. If the failure persists (especially for hardware components like Touch or Speaker), it may indicate a physical fault requiring repair.

How to Test Your Samsung Phone: A Comprehensive Guide to Checking for Defects (2026)

30/04/2026

Whether you are planning to buy a used Samsung smartphone or are experiencing sudden technical issues with your current device, knowing how to perform "Hardware Diagnostics" is an essential skill. Samsung provides built-in, official methods to test every component of your phone without needing to download suspicious third-party software.

Method 1: The Secret Service Menu

This is the most popular method for professionals and provides direct hardware access.

Open the Phone app.
Dial the code: *#0*#
A menu will appear with squares for each hardware component (e.g., Touch, Color, Speaker, Vibration, Camera).

Pro-Tip: If you tap the Touch square, you can draw on the screen to ensure every single pixel and touch zone is responsive.

Method 2: Samsung Members App (The Safest Way)

If you prefer a user-friendly graphical interface, the "Samsung Members" app—which comes pre-installed on most Samsung devices—is your best choice:

Open the Samsung Members app.
Select Support from the bottom menu.
Tap on Phone diagnostics.
You can choose individual tests or tap "Test all" to have the system automatically check your battery, network signal, sensors, and ports.

Checklist for Buying a Used Phone:

Screen: Look for bright or dead pixels and test the touch response in all corners.
Battery: Check the "Battery Status" via the Samsung Members app; if it says "Need to replace," keep that in mind when negotiating the price.
Camera: Test the focus on both near and far objects and ensure the flash works properly.
Ports: Try connecting a charging cable and earphones to ensure the ports aren't loose or corroded.

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