Xiaomi’s smartphones, whether Redmi or POCO, are no longer just bells, and we store emails, banking apps, personal photos and corporate chats inside the device, but if the phone falls into the wrong hands, a standard lock screen may not be enough to protect sensitive information from prying eyes.
Fortunately, the MIUI shell and the newer HyperOS offer powerful built-in tools to encrypt access to specific programs, you can hide them from your desktop or just put an extra password, and let's take a look at all the methods available to keep your data private in any situation.
Before we get to the settings, it's worth noting that the menu interface may vary slightly depending on the version of the operating system. We'll look at the current action algorithms that will suit most modern models. Data security is a priority, so you shouldn't ignore these features.
Built-in function "Application Protection"
The easiest and most efficient way to do this is to use a regular tool that allows you to block access to selected programs, requiring you to enter a password, a pattern lock or a fingerprint every time you run. To activate, go to Settings and find the Applications section. In some firmware versions, this item may be called Application Protection right in the main settings menu.
Once logged in, the system will prompt you to create a special password for protection. Importantly, it may be a separate code, different from the unlock password, which creates an additional layer of security. You can also link the protection to biometric data if your smartphone supports fingerprint scanner or facial recognition.
Once you set your password, you'll see a list of all the programs you've installed, just switch the sliders against the apps you want to hide from others, and now when you try to run something like WhatsApp or the Gallery, you'll need to log in.
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Built-in protection works even without the Internet and does not require the installation of third-party software, which saves battery power.
It is flexible: you can add or remove applications from the protected list at any time, and you can also enable the “Hide Content” option in the security settings so that notifications from these programs do not appear on the locked screen.
Set up biometrics for access
Entering a password can be tedious every time, especially if you go to the messenger dozens of times a day, which is why Xiaomi allows you to use biometrics, which is not only more convenient, but often safer, because the password can be peeked and your finger can't.
To activate this option, make sure that you have at least one fingerprint or facial recognition set up in the Passwords and Security section. Then, in the Applications Protection menu, look for the Protection Settings (usually the gear in the corner) and activate the Use Fingerprint switch.
- 🔒 Fingerprint – the fastest and most reliable way to authenticate on modern smartphones.
- 👁️ Facial recognition – convenient, but may work worse in poor lighting or if you wear glasses/masks.
- 🔢 A pattern lock is a classic method that cannot be reset by biometrics unless you set a password yourself.
Remember that once the device is rebooted, the system will always require the primary password or pin for the first time, a standard Android security measure that cannot be bypassed. Biometric data is stored in the secure module of the phone and is not transmitted to the manufacturer's servers.
⚠️ Note: Do not use simple graphic keys (such as the letter "G" or "Z"), as fingerprints on the screen can reveal your secret.
“Hidden Apps” mode for maximum privacy
Sometimes it's not enough to just log in, because the fact that an application is available can be informative for the verifier, and for those cases, MIUI's Hidden Applications mode is in place, and it removes the program icon from the desktop and menu completely.
To activate this mode, open the Security app (green zipper icon), scroll down to the Hidden Apps section and turn it on. The system will prompt you to create a special gesture or enter a secret code that will open the hidden folder.
Once activated, you will need to enter the application protection password you set before to confirm your device ownership, then you can choose which programs to hide, their icons will disappear, but they will remain installed and work in the background.
How do I find hidden applications?
You can remove the app from the hidden list at any time through the same menu, and it's a great way to hide bank clients or personal archives from children or colleagues who have taken a "view a photo" phone.
Use of guest mode and second space
If you have to give someone else a phone, but you don't want that person to see your personal data, standard app locking might not be enough. This is where Second Space comes in. This is actually creating a second profile inside a smartphone.
Go to Settings → Additional Settings → Second Space. The system will create a clean desktop, like on a new phone. You can set a separate login password to that space or switch between profiles through a notification curtain or a special fingerprint.
In the second space, you can install copies of social networks, games or instant messengers, and the data in those copies will be completely independent of the main profile, and it's the perfect solution for separating work and personal life, or for handing the device over to a child.
| Function | Main space | Second space |
|---|---|---|
| Access to files | Full access | Isolated. |
| Accounts. | Your personal | Individual (can be cloned) |
| Notifications | All notices | Only from applications in the 2nd profile |
| Switching | Through settings or password | Password or fingerprint. |
The use of the second space does not require ROOT-It works stably on all modern models of Redmi Note and Xiaomi Mi. However, it is worth considering that applications running in the second space consume the device’s RAM.
☑️ Checking the security of the smartphone
Third-party blocking solutions
Xiaomi’s regular hardware is powerful, but sometimes MIUI functionality is lacking, or the interface of a particular model (especially global versions) is different from China’s.
Popular solutions like DoGlobal’s AppLock or Norton App Lock offer additional features, such as creating fake password errors or stealthy photos of an attacker, and installing them is simple: download, give permissions, and select protected objects.
- 🛡️ AppLock – allows you to put different passwords on different applications and has an Incognito mode».
- 📸 Smart AppLock – can take a photo of someone who entered the password incorrectly.
- 🕵️♂️ Calculator Vault – masquerades as a calculator, but inside stores hidden files and applications.
When using third-party software, carefully read the permissions requested. Access to a camera and microphone for a blocker is normal, but requiring access to contacts or SMS without an explicit need should be alert.
⚠️ Note: Antivirus programs may mark some blockers as potentially unwanted software, as they are embedded in the processes of other applications.
What to do with a forgotten password
A situation where a user forgets a password created specifically to protect applications is common. Unless you have attached a Mi Account or a check issue (if the MIUI version allows), it can be difficult to restore access.
In most cases, the system will suggest resetting the application protection password through the answer to the secret question you asked when you first set up, but if you don't remember the answer, the only way out is to completely reset your phone settings or delete the data of a particular application, which will lead to loss of correspondence inside it.
To avoid such problems, it is recommended:
- 📝 Write complex passwords to a secure location or password manager.
- 🔗 Linking a Mi Cloud account for recovery.
- 🧠 Use biometrics as the primary method and password as a backup method.
Don’t rely on the “magic” reset codes found on the Internet. Android security is designed so that without the confirmation of the owner (through an account or biometrics), access to encrypted data is impossible.
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Use mnemonic phrases to create passwords: for example, “I love 84 fish!” (I love fish 84 times) – this is easy to remember and difficult to pick up.