Here’s how to access the secret hardware diagnostic menu on your Samsung phone

If you’ve just bought a Samsung smartphone or are getting your old model ready for sale, you want to know if everything is working as it should. Samsung phones these days are jam-packed with features and sensors, so it’s not easy to keep track of what’s going right and what’s not.

This is where Samsung’s hidden diagnostics menu comes in. This secret feature, hidden in models released since 2016, requires you to enter a specific code to unlock access to an app that allows you to run a wide variety of diagnostics on your phone’s hardware. Read on to find out the secret!

Access to the hidden Samsung diagnostics menu

Accessing the diagnostics menu is a simple process and should be available to anyone with a reasonably modern Samsung phone. There were reports that cellular carriers like Verizon and Sprint blocked diagnostics a few years ago. If you have one of their plans and you can’t access it, that’s probably the problem. Fortunately, however, users suggest that Sprint has since relaxed the blocking of code-based functionality in newer models.

We tested it ourselves on the Samsung Galaxy Z Fold 3. Since the Fold 3 has some unique features to test, keep in mind that what you see in the screenshots below may not exactly match what you see on your phone. In the menu you can only test the functions that your device supports. So if you know your phone doesn’t support the S-Pen e.g. example, You won’t see this button if you load it.

Starting diagnostics is easy: just open your phone app and enter * # 0 * # . The phone should immediately open the diagnostics menu shown below. Exiting the menu can be a little trickier as this menu disables some of your usual swiping functions. hold the power Key and press the home Icon works well for exiting.

We’ve covered some of the most useful tools in the Samsung Diagnostics menu below.

Samsung’s diagnostic tools explained

While you can find most of these tools in other diagnostic apps on the Play Store, it comes in handy to gather them under one built-in utility, and it doesn’t hurt that this is Samsung’s preferred diagnostic. You will get a clear indication of which sensors are working and which are not by testing them here in the menu.


The accelerometer has become a huge part of modern smartphones. Many apps use or rely on it, such as Android’s Earthquake Alert System. Samsung’s Diagnostics menu allows you to check the accelerometer’s functionality and updates in real time in the sensor Menu that shows how your phone handles movements. You can read this information in its raw form or run a test to create a more readable chart.

Oddly enough, you also have the option to do an image test on the accelerometer. When you do this, you will see the same data as in the sensor Menu accompanied by a terribly distorted image of a dog. This allows you to test the screen transitions from portrait to landscape and when the accelerometer is doing them.

Fingerprint sensor

Fingerprint technology has added an extra level of security to modern smartphones in addition to the standard PIN code and facial recognition options. the sensor You can also test the technology of your fingerprint reader in the menu. It provides information about the hardware used as well as a pass / fail diagram with the functional levels.

We ran two tests to show what the diagnosis was showing. In the first, we carried out the test as usual with the fingerprint scanner, but with our fingers, which gave us passes across the board. However, executing the rest with an unregistered finger on the sensor ends with the fail state shown in the last screenshot.

If you get these readings consistently while using the scanner properly, it could be a sign of hardware problems.

Screen color (RGB) checker

Samsung’s diagnostic panel makes testing the color output of your phone easy and offers a choice of Red , green , and blue at the top of the menu. Your entire screen will change to the color you choose, which should help you spot areas where the display looks inconsistent or faded.

Each option should represent a single block of color so errors are inevitable. It should also help you identify stuck pixels or screen burning, which are often unsightly. Selection of the fourth color palette, black , can sometimes help reverse burn-in effects before they become permanent, but you may need to try several AMOLED burn-in corrections to see results. If the diagnostics help you catch the signs early, you may not need to send your phone in for repair.

Grip sensor

Since it’s not a feature with obvious benefits, most people are unaware that smartphones often contain grip sensors. Some phones have experimented with squeeze gestures that let you open Google Assistant by squeezing your device, but they’re not standout features on all phones.

Nevertheless, grip sensors are helpful. For example, these can detect how you are holding your phone to switch antennas and prevent your hands from blocking or weakening signals.

Samsung’s diagnostic panel gives you an easy way to check that your phone’s grip functions are working as expected. selection Handle sensor opens the menu shown above, which detects and displays your phone’s grip sensors. When you squeeze your phone, the device should vibrate while the activated sensor flashes blue on the screen, indicating that everything is working properly.

S-Pen functionality

There are many reasons to use a pen with your smartphone, from writing and scribbling to photo editing, especially on larger devices like the Note series. However, they’re still relatively niche-shaped so you’ll only see those S pen Diagnostic entries, if your phone supports them.

If so, you should probably make sure that the pen is properly calibrated before getting too excited about using it.

The options here are pretty simple. By doing S pen Menu, S-pen drawing will go to the screens shown above to test your calibration. Trying to draw a straight line through the boxes will quickly let you know if your pen is tracking correctly. S-pen hover In the meantime, you can check that all the clicks you make while moving the stylus across the screen are registered in the specified location.

Samsung diagnostics for a healthy device

Samsung’s diagnostic panel is a fantastic tool for making sure that all of your phone’s internal components are working as intended. If you’ve just bought your device, you’ll want to know what you’ve paid for. And if you sell it, the buyer will likely want to know the same thing.

Remembering this nifty code can be helpful when you run into hardware problems and should give you a glimpse of what is happening. It won’t be the solution to every one of your problems, but it will help you identify the root cause and find the right specific diagnostic app with the answers you are looking for.

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