Modern Xiaomi smartphones store a huge amount of confidential information, and WhatsApp messenger is often the main target for attackers or curious acquaintances. Standard password protection of the screen is sometimes not enough, especially if the device is unlocked.
MIUI and the new HyperOS have deep integration with the system security modules, allowing you to use a fingerprint scanner or Face ID to block applications. This process does not require third-party software installation, since the functionality is built into the messenger itself. You only need to activate the appropriate settings in the settings correctly.
In this article, we will discuss in detail the algorithm of actions that will allow you to close access to chats without re-authorizing via SMS, using only your finger.We will look at the nuances of scanners under the screen and on the side edge, and also solve the typical problems that users face when setting up.
Preparation of the smartphone for biometric authorization
Before you go to the settings of the messenger itself, you need to make sure that your Xiaomi smartphone is technically ready for working with biometrics. Android security system will not allow applications to use the scanner if the global settings of the phone do not have your biometric data. This is a basic level of protection, without which further action is impossible.
Go to the basic settings of the device and find the section that handles passwords and security. Depending on the version of the MIUI shell, this item may be called Passwords and Security or simply Security. Here you should see the option to add a fingerprint. If you have not previously used a scanner to unlock the screen, the system will require you to create a new profile.
- 👉 Open Settings and go to Passwords and Security.
- 👉 Select Fingerprints and add your finger by following the instructions on the screen.
- 👉 Make sure the “Unlock Screen” switch is activated for the added fingerprint.
- 👉 For greater reliability, it is recommended to add prints of both hands.
It is important to note that the read quality depends on the condition of the sensor and the surface of the finger. If you have a model with a subscreen scanner, make sure that the screen is clean and there are no protective glasses more than 0.3 mm thick that can distort the signal. Owners of models with a side scanner built into the on button should be careful when wearing covers so as not to block access to the sensor.
⚠️ Warning: Do not use the Fast Unlock feature in your fingerprint settings if you want maximum security.This feature allows you to unlock your phone when the screen is off without first pressing a button, which can lead to accidental access.
☑️ Ready to set up WhatsApp
Activate protection in the WhatsApp app
Once the system biometrics have been successfully configured, you can go directly to the messenger. WhatsApp developers have built-in locking mechanism that works independently of third-party app locks, often found in Google Play directories, which ensures more stable operation and less battery consumption.
Open the app and go to the settings menu. In the Android interface, it's usually located in the top right (three dots) or in the bottom navigation bar (the Settings tab), and you're interested in the Privacy section, and that's where the key access options for your dialogs are hidden.
Find Fingerprint Lock, and when you first log in, the system will ask you to verify your identity using a fingerprint that was previously stored in the system, so that the app can make sure that the account owner is the one who is setting up the setting, and then you will see a menu with the lock options that opens before you.
- 🔒 Activate the switch Lock the fingerprint.
- 👆 Select the option “Require unlocking».
- 👁️ Decide whether to hide the content of notifications on a locked screen.
- ✅ Confirm the action by re-applying your finger.
The functionality allows you to flexibly adjust the frequency of the biometric request. You can choose when the application requests a fingerprint every time you open, or you can set the timer for, for example, 1 minute or 1 hour.
What is “Hide Content”?
Configure the lock parameters and notifications
Deep security settings allow WhatsApp to adapt to your daily routine. Standard settings can be uncomfortable if you hold your phone in your hands all the time, but risk security if the device is on your desk in the office. Understanding the differences between “Immediately”, “In 1 minute” and “In 1 hour” modes will help you find a balance.
The instant mode is the safest, but the least convenient. The app will request a finger scan every time you leave the background. This is ideal for situations where the phone can be used by outsiders, such as in public transport or in a crowded place. In this mode, MIUI can aggressively unload the application from memory, which also improves security.
The 1 minute option gives you a short window to work, so if you've curled up your messenger to answer a call or open your browser, you won't need to log in again within a minute, which reduces the load on your fingerprint scanner and saves time while still protecting you from accidental access if you're distracted for a minute.
| Parameter | Description of action | Recommendation for use |
|---|---|---|
| Right away. | Request a fingerprint at each opening | Maximum protection in public places |
| In 1 minute. | Request 60 seconds after folding | Optimal balance for daily use |
| In 1 hour. | Request after 60 minutes of downtime | For home use or trusted environment |
| Hide contents | Masking text in notifications | Recommended for all users |
Notifications are not to be forgotten. Even if chat rooms are closed, the text of a new message can “light up” in the curtain, and enabling the option to hide content ensures that no one will read confidential information just by looking at your Xiaomi screen when the message arrives.
Use of the built-in MIUI application lock
Xiaomi smartphones have a second layer of protection that works at the system level, not the application level, which is the App Lock feature, which can work in parallel with the internal WhatsApp lock or replace it, providing more extensive features such as a sign-in or a system-style Face ID.
To activate this feature, go to Settings → Applications → Application Protection (or search for App Lock).The system will prompt you to create a separate password or use an existing Mi Account. Once you set the password, you will be prompted to select protection apps. Find WhatsApp on the list and activate the switch.
⚠️ Note: When using the application system lock on Xiaomi, logging into WhatsApp may require dual authorization: first a system password/fingerprint, then an internal WhatsApp validation.
The advantage of the system lock is that it prevents even the application from starting. WhatsApp's internal security is activated after the program window is opened. In addition, the system lock on MIUI often works more stable with Face ID biometrics than some versions of the messenger itself.
If you choose to use a system lock, the internal lock in WhatsApp itself should be turned off so as not to create unnecessary steps when you sign in. To do this, just go back to the messenger privacy settings and turn off fingerprint lock, which will speed up access to correspondence, maintaining a high level of security.
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Use the “Second Space” on Xiaomi to create a completely isolated copy of WhatsApp with a different account and a separate fingerprint to sign in.
Solving Typical Problems with Biometrics
Despite the system’s fine-tuning, users sometimes face situations where the fingerprint is no longer recognized or the lock function is not working correctly, most often the problem lies in updating the MIUI software or the WhatsApp application itself, which may have reset the access rights.
One common error is the message “Failed to use fingerprint” that can occur if you recently changed your screen unlock password or deleted your biometrics, in which case you need to re-check the confirmation procedure in the messenger settings, and it is worth checking whether the biometrics feature is disabled in the global Android security settings.
- 🔄 Reboot Xiaomi smartphone to reset security services.
- 🗑️ Remove the old print and add it again in the system settings.
- 📱 Make sure that the version of WhatsApp is updated via Google Play or AppGallery.
- 🔐 Reset the lock settings in the application itself and turn them on again.
If the scanner is slow or requires multiple fingerstrokes, try clearing the app's cache. Go to Settings → Apps → All apps → WhatsApp → Memory → Clear cache. It's important not to confuse this with "Data Cleanup," as the last action will delete the entire correspondence history if you don't make a backup.
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Biometric failures are solved 90% of the time by overwriting the fingerprint in the system and re-activating the function within the application.