Owners of Xiaomi, Redmi and POCO smartphones often face the need to hide personal correspondence or financial data from prying eyes. The built-in MIUI and HyperOS tools allow you to reliably protect individual programs without installing third-party software, this is especially true when the device can be used by children or colleagues.
The system lock function works at the core shell level, which ensures stability and no advertising inside the secure perimeter. You do not need to search for complex third-party launchers or buy paid antiviruses.
Before you start setting up, it’s important to understand that the protection will be tied to your Mi Account or local unlock password, which creates an additional layer of security that can’t be avoided by simply restarting your device.
⚠️ Note: If you forget the password from App Lock and do not link Mi-account for recovery, you can only return access to blocked applications by completely resetting your phone settings.
The primary data protection tool is in the standard Security app, which is pre-installed on all the brand's devices, and that's where the key privacy settings are focused. To get started, look for a shield icon on your desktop with a green or blue background.
Once you start the app, scroll down to Tools, where you will see Application Protection (or App Lock) and when you first start it will ask you to create a unique pattern lock or enter a digital key. PIN-This code will be different from the unlock code, which provides dual protection.
- 🔒 Select the type of protection: pattern lock, 4-digit or 6-digit password.
- 📲 Link Mi-account to allow password reset via the Internet.
- 👁️ Set up access via fingerprint or face ID quick-entry.
- 🔔 Enable the concealment of notification content for maximum privacy.
Once you have the code installed, you will see a list of all the installed programs, and you just need to switch sliders against the apps you want to hide, and users usually protect WhatsApp, Telegram, Viber and banking apps first.
☑️ Setting up application protection
And it's important to note that once you activate the security, every time you run a selected program, you'll see a password window or a fingerprint request, which may seem inconvenient, but that's how the security mechanism works, and over time, you'll get used to using biometrics, and it'll take a fraction of a second.
One of the most useful features in MIUI is the ability to hide not only the sign-in to the application, but also the notifications themselves. If this option is activated, then even with an unlocked phone, the text of the incoming message from the Secure Applications will not appear on the lock screen or in the notification curtain.
To set this setting, you need to click on the gear icon in the upper right corner inside the Application Protection menu, and there's a Hide Content switch, and when you activate it, you'll see that the notifications will read "Content Hidden" instead of the message text.
⚠️ Note: Hiding the content of notifications only works if the application itself is running through a secure profile. Some firmware versions require additional configuration in the Notifications section.
And you can also find the Unlock by Fingerprint option on this menu, which allows you to open secure applications instantly using a fingerprint scanner, without entering a pattern lock every time, which makes it much faster to use instant messengers and gallery.
Users often confuse App Lock with Second Space Mode, which are fundamentally different data protection tools. App Lock simply puts a door on the entrance to a particular application, leaving it in the general list of programs.
The second space creates a completely separate environment on your phone, as if you had a second smartphone in your pocket, and you have your apps, your photos, your accounts, and you switch between the main and second spaces through a special password or fingerprint when you unlock the screen.
If your goal is to completely isolate work files from personal ones or hide the presence of certain programs from a child, then App Lock may not be enough, in which case you should use Second Space, but standard application blocking is enough to quickly protect correspondence from prying glances.
What is the difference between the guest mode and the second space?
There are several common problems that users face when setting up protection, and it often happens that after updating the system, the settings are reset or the fingerprint to log into applications stops working.
If Face ID or the fingerprint scanner to unlock apps stops working, try removing the old fingerprint in your security settings and writing it back down. Also make sure that the App Lock settings tick against the biometric unlock.
Sometimes users complain that applications crash or are not properly protected, and this may be due to aggressive energy savings, so you go to the battery settings and select No Limits mode for the protected application.
| Parameter | App Lock | Second space | Hidden album |
|---|---|---|---|
| Purpose of protection | Separate annexes | Complete data isolation | Photos and videos only |
| Difficulty of access | Low (one password) | High (separate OS) | Medium (password + concealment) |
| Impact on the battery | Minimum | Average (two profiles are working) | Minimum |
| Notifications | Can't hide. | They only come in profile. | Not displayed. |
For owners of new models based on HyperOS interface may be slightly different from the classic MIUI. the logic of the work remained the same, but the visual design and arrangement of elements have become more minimalistic.
In HyperOS, access to protection settings is often listed in the general Settings menu → Applications → Application Lock. If you don’t find this item, search for settings by typing “App Lock” or “Protection”.
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Use different passwords to unlock the screen and for App Lock. If an attacker sees you enter the screen code, the second layer of protection will save your data.
Alternative authorization methods such as face unlocking should not be ignored, and on modern Xiaomi smartphones, this feature works fast enough and adds convenience, although it is inferior in security to fingerprinting.
Remember that no security system is absolute. However, the combination of a pattern lock, biometrics and notification hiding makes it extremely difficult for outsiders to access your data.
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System protection applications on Xiaomi does not require superuser rights and works more stable than third-party counterparts, as it is integrated deep into the shell. MIUI/HyperOS.