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Galaxy S21 Tip: Learn Biometric security [Samsung Android 12/One UI 4]



Samsung One UI 4.0 is now available for the Galaxy S21 series (as Beta testing activity) in select countries, which is based on Google’s Andriod 12 operating system. The beta program allows users to experience the upcoming OS ahead of the stable launch.

With One UI 4 Beta 2, Samsung has made various adjustments to the user interface and functions. In addition to new features, it also enhances the security and privacy of smartphones. So, in this article, we will discuss how you can enable biometric security on the Galaxy S21 smartphones.

What is Biometric security?

Biometric security provides a more convenient but less secure device confirmation method. Under the hierarchical authentication model, primary authentication (that is, patterns based on knowledge factors, such as PINs, patterns, and passwords) provides the highest level of security. Biometrics is the second layer of identity verification, providing a balance between convenience and security.


Biometric security includes:

  • Face recognition
  • Fingerprint scanner

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How to enable Face recognition on Galaxy S21 series?

You can enable Face Recognition to unlock your screen. To use your face to unlock your device, you must set a pattern, PIN, or password.

  • Face recognition is less secure than Pattern, PIN, or Password. Your device could be unlocked by someone or something that looks like your image.
  • Some conditions may affect face recognition, including wearing glasses, hats, beards, or heavy make-up.
  • When registering your face, ensure that you are in a well-lit area and the camera lens is clean.


  1. From Settings, tap Biometrics and security > Face recognition.
  2. Follow the prompts to register your face.

Face recognition management:

Customize how face recognition works.

  1. Go to the Settings
  2. tap Biometrics and security
  3. Face recognition.
  • Remove face data: Delete existing faces.
  • Add alternative look: Enhance face recognition by adding an alternative
  • Face unlock: Enable or disable face recognition security.
  • Stay on Lock screen until swipe: When you unlock your device with face
    recognition, stay on the Lock screen until you swipe the screen.
  • Faster recognition: Turn on for faster face recognition. Turn off to increase security and make it harder to unlock using an image or video of your likeness.
  • Require open eyes: Facial recognition will only recognize your face when
    your eyes are open.
  • Brighten screen: Increase the screen brightness temporarily so that your face can be recognized in dark conditions.
  • About unlocking with biometrics: Learn additional information about securing your device with biometrics.

How to use Fingerprint scanner on Galaxy S21 series?

Use fingerprint recognition as an alternative to entering passwords in certain apps. You can also use your fingerprint to verify your identity when logging in to your Samsung account. To use your fingerprint to unlock your device, you must set a pattern, PIN, or password.

  1. From Settings, tap Biometrics and security > Fingerprints.
  2. Follow the prompts to register your fingerprint.

Fingerprint management:

Add, delete, and rename fingerprints.


From Settings, tap Biometrics and security > Fingerprints for the following options:

  • The list of registered fingerprints is at the top of this list. You can tap a fingerprint to remove or rename it.
  • Add fingerprint: Simply follow the prompts to register another fingerprint.
  • Check added fingerprints: Scan your fingerprint to see if it has been registered.

Fingerprint verification settings:

Use fingerprint recognition to verify your identity in supported apps and actions.

  • From Settings, tap Biometrics and security > Fingerprints for the following options:
  • Fingerprint unlock: Use your fingerprint for identification when unlocking your device.
  • Fingerprint always on: Scan your fingerprint even when the screen is off.
  • Show icon when screen is off: Show the fingerprint icon when the screen is off.
  • Show animation when unlocking: Show an animation when you use fingerprint verification.
  • About unlocking with biometrics: Read details on the requirements each biometric security feature has for using your pattern, PIN, or password as a backup.

Biometrics settings

Configure your preferences for biometric security options.

  1. Click on Settings
  2. Tap Biometrics and security
  3. Click on More biometrics settings for the following:
  • Show unlock transition effect: Show a transition effect when you use biometrics to unlock your device.
  • Biometrics security patch: View the software version of the biometric security features.
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How to resolve these common Samsung Galaxy Z Fold 3 problems



Samsung Galaxy Z Fold 3

Samsung Galaxy Z Fold 3 is the 3rd generation best Samsung (or anyone else) has ever produced. It improves the durability of the Z Fold 2, which provides water resistance with IPX8, Gorilla Glass Victus, and “sweeper” bristles inside the hinge to retain dust and extend the duration of the phone.

It is also an excellent all-around tool, boasting a Qualcomm Snapdragon 888 processor and a three-lens rear camera system. On top of this, it goes fold out, making it great for you to do multitasking work and make a product, watch TV and media, and entertain your friends.

Regarding, a state-of-the-art condition like the Z Fold 3, it may not be completely free of problems with lubricants and technical equipment. Fortunately, we have compiled a list of common Samsung Samsung Z Fold 3 problems and how to fix them.


This gives you details on everything from battery discharge issues to issues with Samsung Pay, helping you make the most of your new phone and not letting small snags ruin your enjoyment.

As with our troubleshooting pieces, this article will be updated as we encounter new common issues, so please come back again if the issue you are facing isn’t covered yet.

Galaxy Z Fold 3

Camera app not displaying Dual Screen button for selfies – Issue

A number of users on Samsung’s Community forum have noted that, when trying to take a selfie in the Camera app, they don’t see the Dual Screen button.



  • Fortunately, there’s a very quick fix for this. As other Samsung Community users have noted, opening the Camera app from the cover screen (rather than the main screen) will ensure that the Dual Screen button appears where it should.

Screen protector problems

Some users of the Z Fold 3 have encountered a variety of issues with the phone’s pre-installed screen protectors. These problems aren’t always exactly the same, with some reporting bubbles and others reporting inconsistencies in the protector’s adherence to the screen.

Since such issues can be frustrating, you are strongly advised not to remove the pre-installed screen protector, especially when talking about a large folding screen. Instead, you should contact Samsung as soon as possible to arrange a repair or replacement.

On the other hand, at least one user asked if it was safe to remove the outer film that came wrapped in wire outside the box.


Unable to acquire GPS location in apps – Issue

Even though the Z Fold 3 has only just been released, some users have already complained that apps they use are unable to receive their GPS location data from the phone.

Possible solutions

This is an issue that has affected other Samsung devices in recent years, so you may simply have to wait for a software update for a fix. You can check if one is available by doing the following:

  1. Open the Settings app on your device.
  2. Scroll down to Software Update.
  3. Select Download and Install.
  4. If a new update is available, your device will obtain it.

Can’t activate unlocked Z Fold 3 on Sprint – Issue

This is one of the more complicated and difficult problems encountered so far with the Galaxy Z Fold 3. Quite a large number of United States-based users have reported that they can’t activate their phones on Sprint. This seems to be an issue arising from T-Mobile’s merger with Sprint and from how Samsung has optimized the phone (or not) for using a T-Mobile or Sprint SIM card.


As of writing, the only fix appears to be contacting T-Mobile and/or Sprint and trying a different SIM card (i.e., a T-Mobile rather than Sprint SIM). That said, some users have reported that the issue was resolved after several days, with a few noting that they were eventually able to activate their phones via either the T-Mobile or Sprint websites.

S Pen to Text not working properly – Issue

couple of users have reported that the Convert Handwriting to Text feature on their Z Fold 3 phones doesn’t work properly. Normally, this lets users of the Samsung Notes app handwrite a phrase or sentence and then convert it into normal text. Unfortunately, the affected users note that the process of conversion malfunctions, with random words appearing where they shouldn’t.

Possible fixes

  • As of writing, there isn’t a definitive solution for this. You may simply have to wait for a software update from Samsung and then install it, which you can do by going to Settings > Software Update > Download and Install.
  • Given the Samsung Notes app is responsible for converting handwriting, you may also want to try updating it. This can be done by going to the Google Play Store, searching for Samsung Notes, and then tapping Update.

Galaxy Z Fold 3

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Aside from SammyFans’ official Twitter and Facebook page, you can also join our Telegram channel and subscribe to our YouTube channel to get notified of every latest development in Samsung and One UI ecosystem. Also, you can follow us on Google News for regular updates

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Here are seven excellent features that Samsung DeX has to offer




Samsung DeX is certainly the best way to get a desktop-like experience from a phone. The platform was first released with the Galaxy S8 series as a way to use your phone as a computer-like interface and has since grown into a smooth, streamlined visual connector that you can use for production and entertainment activities alike.

DeX is now a few years old, and Samsung has built a lot of good features in it. Interested in learning more about it yourself? Here are seven excellent features that Samsung DeX has to offer.

Samsung Dex Features 

Connect wherever you want

Before you can immerse yourself in using DeX actually, you will need to connect it to a monitor or display. Thankfully, there are many ways to do this. The easiest way is probably to simply get the HDMI to USB-C cable and connect it to your phone. You don’t need to use the first group cable to do so – usually, users used an Amazon adapter and a standard HDMI cable, and it worked fine.


Alternatively, you can connect wirelessly – just open the Settings app, go to Advanced Features> Samsung DeX, then open DeX, choose to use DeX on TV or monitor, and wait for the system to receive a display. Most internet-connected TVs and monitors should work through this tech. Lastly, you can connect to DeX using a standard PC or Mac using the DeX app.

Use your phone as a trackpad

Don’t have an external keyboard or mouse to use with DeX? No worries! DeX allows you to use your phone as a trackpad, and while not the most accurate experience, it works well on the pinch.

To use the smartphone as a DeX trackpad, connect to the monitor, swipe down the notification shade on your phone, and select the option to use your phone as a trackpad. You can rotate the screen by opening the phone the way you would like with any app, tap with two fingers to right-click and do some of the things you would expect to be able to do in the standard tracking pad.


Customize the DeX wallpaper

You can customize some features of the Samsung DeX as you would on any other desktop – and customizing them doesn’t interfere with your phone when you use it normally.

Most importantly, you can change your DeX wallpaper, and in doing so it will not change the background image of your phone. To do this, while using your DeX, simply right-click (or tap two fingers with the touchpad) on the desktop and select the Wallpaper option. Then you can switch to your favorite wallpaper.

Make sure applications are always accessible

Do you use other apps regularly? If so, you may want to pin them to the taskbar so you can open them no matter what you do. To pin an application in the taskbar, open the application, right-click the icon in the taskbar at the bottom of the screen, and then tap the Taskbar Login Shortcut button. You will always see the app icon, so you can always open it.


Learn keyboard shortcuts

As with any desktop app, the best way to do more on DeX is to learn keyboard shortcuts. There are tons of shortcuts in DeX to read, including those related to doing multiple tasks.

Keyboard shortcuts vary depending on how you use DeX – because you can use it on a monitor or your Mac or PC. When you first connect your DeX with the keyboard, you will be allowed to see a list of keyboard shortcuts to get started, which can be helpful.

Use apps designed for DeX

Most apps will work fine without the need for special DeX versions, but if you regularly use certain apps, it might be best to check that they are well-suited for use with DeX.


To see a list of DeX-optimized apps, open your app list and select the link at the top of the Check out apps for Samsung DeX. You will see many top applications listed, including Microsoft Office Office, a series of Adobe applications, and more.

Samsung Dex Features

Manage windows

Unfortunately, DeX is not good at helping you manage your windows, and I hope it will get better in the years to come. That said, there are a few things that can help. For example, it is very easy to enter full-screen mode, and there are many ways to do that. You can double-click the top of the window, drag it to the top of the screen, and then release it, or you can tap the full-screen button at the top right of the window.

Alternatively, you will need to stick to the resizing apps manually, which you can do by holding the corner of the app and resizing it. Alternatively, some shortcuts can help with changing app size and cracks, or those shortcuts will vary depending on how you use DeX.


Samsung Dex Features Tips

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Aside from SammyFans’ official Twitter and Facebook page, you can also join our Telegram channel and subscribe to our YouTube channel to get notified of every latest development in Samsung and One UI ecosystem. Also, you can follow us on Google News for regular updates. 

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Here’s how to enable Fast charging mode on Galaxy S21



Surprisingly, Samsung’s fast charging is automatically disabled on Galaxy S21 series. Although Superfast charging is enabled by default. But you can easily change that by going to Settings, and we’ll explain to you how to do it in this article.

The most likely reason for faster charging is disabled, to save your long battery life. And if you are using a non-Samsung 25W charger, you will want this turned on.

If you are using a different charger, such as an 18W charger, then consider your Galaxy S21 charging very slowly. This is probably why. We came across this issue while working on our review of the Galaxy S21 Ultra and went hunting to find out why. That’s why. So keep that in mind.


Samsung Galaxy S21

Here’s how you can enable fast charging on the Galaxy S21 series:

  • First, open Settings.
  • Then tap on “Battery and device care”.
  • From there, tap on “Battery”.
  • At the bottom of that screen, you will view an option for “More battery settings” tap on that.

Under the charging header on that screen, you will see three options. By default, the first one is displayed, which is fast charging. While Super fast charging and fast wireless charging are turned on default. Just tap on the toggle next to “Fast Charging” to turn on instant charging.

This will be required if you are not using a Samsung 25W charger. If you use a slow charger such as a 20W or 18W charger, you will want this turned on, or you will charge a very small fee.

It is strange that this is closed by default. But it may also help save your battery life over time. Since fast charging can damage the battery very quickly.

Get notified –


Aside from SammyFans’ official Twitter and Facebook page, you can also join our Telegram channel and subscribe to our YouTube channel to get notified of every latest development in Samsung and One UI ecosystem. Also, you can follow us on Google News for regular updates. 

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