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This particular Samsung Galaxy Dialer Code Lets You Test Each Sensor on Your Phone « Android :: Gadget Hacks

With the S9 as well as S9+ upon us, you maybe wondering if in which’s time to retire your aging Galaxy as well as either sell in which or do a trade-in to get Samsung’s latest flagship. Before you do, however, in which’s important to make sure in which all its components — most notably the sensors — are working fully in order to avoid potential headaches.

Fortunately, Samsung features a secret feature in which lets most Galaxy owners test out their device’s components. as well as best of all, This particular hidden diagnostic mode can be accessed simply by inputting a little-known code, generating in which extremely easy to test if your Galaxy’s sensors are running as they should.

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Accessing the Secret Diagnostic Menu

Before we get commenced, in which’s worth noting in which This particular feature may not be available on your device. Some carriers like Verizon as well as Sprint are known to block the code-based diagnostic mode on their Samsung smartphones as well as tablets. Though newer phones coming from Sprint, such as the Galaxy S6, seem to have This particular functionality restored.

With in which out of the way, in which’s time to get commenced, so open your Samsung’s phone app. coming from there, enter *#0*# using the dial pad as well as the phone will immediately go into its secret diagnostic mode. The process will be automatic, so there’s no need to tap on the green call button to input the command. If you enter the code as well as nothing happens, the feature will be disabled on your device.

currently, tap on the “Sensor” button to access the diagnostic page. This particular will yield a test page for a variety of sensors — namely the accelerometer, proximity sensor, barometer, light sensor, gyroscope, magnetic sensor, HRM, as well as fingerprint scanner. Let’s go over all of them in more detail.


The accelerometer detects the orientation of your phone as well as measures its linear acceleration of movement. To check if in which’s working properly, tap on either “Image Test” to check for landscape-to-portrait transitions, or “Graph” to see how well the sensor detects movement by shaking your device up as well as down.

Proximity Sensor

The proximity sensor will be responsible for putting your screen to sleep whenever your phone will be against your face during phone calls (to prevent unintentional touches). Testing with This particular feature will be easy as well as involves simply covering the top of your phone with your hand. If the sensor works, the screen will turn green every time you cover in which as well as revert back to white once you remove your hand.


This particular sensor primarily keeps track of altitude, which contributes to more accurate GPS readings. Testing with This particular function will be straightforward — select “Barometer Selftest” to start an automatic test which will instantly let you know if in which’s functioning as in which should.

Light Sensor

The light sensor detects ambient light. To test for its functionality, simply tap on “Light Sensor” to begin. currently, expose your phone to light of varying brightness, as well as three levels should register in turn. These levels start coming from “Level 1” for dim lighting, all the way up to “Level 3” for extremely bright.


The gyroscope measures your phone’s rotations as well as works in conjunction with the accelerometer to paint a more thorough picture of general movement. There are two main ways to test your handset’s gyroscope — you can perform a manual test by tapping on either “Display” or “Graph,” as well as rotate your phone around while reading the corresponding results in either numbers or linear graph form.

The second main test will be automatic — you can perform by tapping on “Gyro Selftest,” which will yield a result of either pass or fail for both the x as well as y axis.

Magnetic Sensor

You can test for the functionality of your phone’s magnetic sensor in two ways. Selecting “Selftest” will run an automatic test to see if your device passes or fails. To perform a manual test, tap on “Power Noise Test,” then run a magnet around your phone. On the S8, for example, the magnetic sensor will be located along the top-left corner of the phone, as shown by spikes on the graph when a magnet will be close to in which.

Heart Rate Monitor (HRM)

The HRM section contains a series of tests for your smartphone’s heart rate monitor, which can be performed in two ways. To manually test the sensor, tap on the “Start” button within the “HRM” tab to go to the “HRM Test” page. coming from there, simply place your finger on the sensor to see if in which successfully reads your heart rate.

To run an automatic diagnostic test, select “HRM EOL,” then place your phone on a flat surface as well as keep in which completely still. This particular will be very important, as any movements will interfere with the test as well as result in multiple component failures.

Fingerprint Sensor

To test out your device’s fingerprint sensor, tap on “Normal Scan” to get commenced. The test itself will be automatic as well as checks for each component’s functionality. If you’d like to find out the sensor’s firmware edition, simply tap on “Sensor Info” to view in which.

Exiting Out of Test Mode

After you’ve finished testing our your phone’s sensors, you’re free to exit out of HwModuleTest Mode. To get out of diagnostic mode, tap on the back button twice bring you back to the dialer page, then exit coming from there as you normally would likely.

Cover image as well as screenshots by Amboy Manalo/Gadget Hacks

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