How to enable locking unknown numbers on Xiaomi Android

Spam calls and intrusive advertising have become a real problem for smartphone owners, especially in the Android ecosystem. Xiaomi users often face the need to quickly restrict access to unwanted contacts to their device to maintain peace of mind and privacy. The built-in MIUI and HyperOS tools offer powerful filtering mechanisms that do not require the installation of third-party software.

In this article, we will take a look at all the available ways of blocking, from simple settings to advanced scenarios, learn how to effectively manage the list of contacts who can not reach you, and protect yourself from fraud. The correct configuration of the system will allow you to forget about the constant ringing of the phone for trifles.

Use of the built-in MIUI call filter

The first and most reliable method is to activate the standard functionality, which is already integrated into the Xiaomi shell. The system provides flexible settings for working with incoming calls, allowing you to block not only specific numbers, but also entire categories of subscribers.

Inside the security menu, you're interested in the Antispam section, and that's where all the incoming traffic controls are concentrated. When you click on the icon, you'll see a list of locked numbers and rule settings. Here, you'll want to look at the settings button, which is usually located in the top right corner of the screen.

In the menu that opens, select Blacklist, then go to Lock Rules, which is where the key option is to Lock Hidden Numbers or Block Unknown Numbers, and activating this switch will instantly disable calls from numbers that are not stored in your phone book.

⚠️ Warning: By including a complete lockdown of unknown numbers, you risk missing important calls from couriers, doctors or delivery services who may be calling from city or mobile numbers not recorded in your contacts.

Additionally, you can set up your lock by country code or prefix in this section, which is especially true for those who often receive spam from certain regions, and the flexibility of MIUI settings allows you to create an almost impenetrable shield against telephone terrorism.

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Periodically check the lock log in the Security app to make sure that important calls were not accidentally cut off by the system.

Blocking through the standard phone application

An alternative and faster way to restrict unwanted subscribers is to use the interface of the caller itself, which is convenient because it does not require going to the deep settings menus of the system, just open the Phone application and find the menu button, which is usually represented by three dots or stripes.

In the drop-down list, select Settings, and then find the Lock section. Here the functionality may vary slightly depending on the firmware version, but the logic remains the same. You can manually add a specific number to the blacklist or activate the switch to lock unknown numbers.

The interface also allows you to view the history of blocked calls right in this menu, which allows you to quickly respond to new waves of spam, if a number is lit up in the list of blocked, it can be permanently blacklisted with one touch.

Configure with Google Assistant and Calls

Many modern Xiaomi smartphones, especially global firmware versions, use the Google Phone app instead of the standard MIUI Dialer. In this case, the configuration logic changes, but becomes even more intelligent.

Open the Google Phone app, click three dots in the corner and select Settings. Next, go to Protect against Spam and Calling Subscribers. Here you will find the Filter Spam Calls switch. When activated, the phone will automatically reset calls flagged in Google databases as suspicious.

There's also a Hide Spam Call option that removes the notifications of those calls so they don't bother you visually, which is especially useful when there are dozens of calls a day, and the system decides whether to bother you with the beep.

The “Do Not Disturb” Regime as a Radical Measure

If a spam attack becomes unbearable, it makes sense to use Do Not Disturb mode. It's an Android system feature that allows you to completely jam all notifications and calls except those you allow. It's not just blocking, it's creating a digital cocoon.

To set up, go to Settings → Sound and Vibration → Don’t Disturb. In this section, you can create a schedule or activate the mode manually. The most important thing here is to set exceptions. You can only allow calls from selected contacts or re-calls from one number for 15 minutes.

This approach guarantees silence, but it requires care. If you forget to turn off this mode, you can skip the emergency call. So using automatic time rules or geolocation in this section will be the most sensible solution for permanent use.

⚠️ Warning: In Do Not Disturb mode, alarm clocks usually continue to work, but it is better to check this setting in advance in exceptions so as not to sleep through an important event.

Third-party applications for spam protection

Built-in tools are good, but specialized applications often have more extensive number databases, such as Truecaller, Yandex with Alice or Kaspersky Who Calls. They work on the principle of crowdsourcing: users tag the fraudsters' numbers themselves, and the database is updated in real time.

When you install an app, it will ask for permission to manage calls and access contacts, which is necessary for the number determination function to work, and once set up, the app will intercept the incoming call, check the number against the database, and, if it matches, reset it or flag it as spam.

• 📞 Truecaller is a global leader with a huge base, but requires careful privacy settings.
• 🛡️ Kaspersky Who Calls – a reliable solution from a well-known vendor with good bases in Russia and the CIS.
• 🔍 Yandex – perfectly determines the numbers of delivery services, taxis and organizations in Russia.

Using third-party software provides an additional layer of protection, especially against new numbers that have not yet made it into the standard operator filters or MIUI system. However, it is worth remembering about battery consumption, since such applications work in the background.

Contact management and automation scenarios

For advanced users, Xiaomi offers a Script Tool (or the use of automation applications like MacroDroid), you can create a rule: if a number that is not in contacts calls, and it is not a repeated call, send it to the user. SMS-Answering “I’m busy” and resetting the challenge.

It's also helpful to clean your phone book regularly from old contacts so that the "Block Unknowns" function works correctly, if you saved your advertiser's number a month ago, the lock on unknown numbers will not apply to him anymore, regular contact hygiene is the key to keeping the list of allowed ones clean.

Don’t forget that carriers also provide network-level blocking services. Check your carrier’s personal account, there may be free options like Antispam that filter traffic before it even reaches your smartphone.

Frequently Asked Questions (FAQ)

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The integrated use of built-in MIUI filters and third-party number databases provides maximum protection against phone spam without losing important calls.