How to lock a number on Xiaomi Redmi 6: the full guide

Mobile phones have long since ceased to be just a means of communication, becoming the center of a user’s digital life, but with convenience come unwanted calls. Owners of budget but reliable devices such as the Xiaomi Redmi 6 often face aggressive telemarketing, spam from banks or calls from scammers. The problem becomes especially urgent when callers use different numbers or hide their ID, requiring the smartphone owner to flexible filtering tools.

The MIUI system, which is based on Android in Xiaomi smartphones, offers built-in security mechanisms that work as well as third-party applications. Blocking unwanted contacts on Redmi 6 can be done in several ways: through the standard Phone application, system settings or using Google services. The choice of a particular method depends on the firmware version and the user’s personal preferences regarding the user’s interface convenience.

In this article, we will take a look at all the methods available to isolate unwanted subscribers so that you can forget about intrusive calls forever. We will look at both manual locking of specific numbers and automatic filters that screen out entire categories of calls.

Use of the built-in MIUI blacklist

The fastest and most effective way to restrict access for a particular subscriber is to use the native functionality of the MIUI shell. In Xiaomi Redmi 6 smartphones, the Phone app already contains a powerful blocker that does not require additional software. To start blocking, you need to open a call log, find the number of the troublemaker and click on it to reveal the detailed action menu.

In the menu that opens, you should select the option “Block” or “Add to blacklist.” After that, all incoming calls from this number will automatically be rejected, and the subscriber will hear the signal “busy” or horns, depending on the operator’s settings. Notably, the blacklist in MIUI works at the system level, so the blocked contact will not be able to reach you even when the screen is turned off.

You can manage the blocked list through the Security app, which is pre-installed on every Xiaomi device, which stores a complete lock history and you can add numbers manually by typing them from the keyboard, which is especially useful if the caller is hiding a number or using different SIM cards for it.

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The built-in MIUI blacklist does not consume battery power as much as third-party number-defining apps, working in the background of the system.

⚠️ Note: When you lock a number through the standard menu, calls sent by this subscriber SMS-The messages will also be hidden and labeled as spam without creating notifications on the screen.

Setup lock through the Security app

To fine-tune filters and manage exceptions, you should go to the central hub of the system settings, the Security app. This system tool combines antivirus, memory cleanup and, importantly for us, a call blocker. To get to the desired section, launch the application and select Lock or Blacklist, which is usually located at the bottom of the screen or in the settings menu.

Here, the user can not only add individual numbers, but also activate smart filters, for example, you can set up automatic deflection of all calls from hidden numbers or from contacts not stored in the phone book, a feature that is extremely useful for those who only expect calls from friends and colleagues, and the rest of the callers are not interesting to him.

In the section of lock settings, you can also select the mode of operation: just drop the call, reset with sending SMS-Silence mode is especially convenient at night or during meetings, when the phone should lie down without sound, but skip calls from selected contacts if they are added to the whitelist.

It is important to check this section regularly to make sure that important numbers are not accidentally included in the list of banned, and the MIUI system allows you to create whole groups of contacts with different filtering rules, which makes communication management as flexible as possible.

Blocking through the standard Android interface (Google)

If you don’t like the Xiaomi Blocker interface or you’re using a clean version of Android Dialer, you can use Google’s standard tools. Redmi 6 may have different calls depending on the firmware version (Global or China), but the Google Phone app is the same for everyone. Open the app, go to settings (three dots in the corner) and select “Blocked Numbers.”

You can manually enter a lock number in this menu or select it from recent calls history. The advantage of using Google tools is sync: if you block a number on one device with Google's acca, it can be blocked on other of your gadgets. Google is also actively updating spam number databases.

One useful feature is the “Filter Spam” option, which automatically detects and rejects calls from known fraudulent numbers. Google’s algorithms analyze millions of user reports, so the effectiveness of such a filter is often higher than that of static databases.

It’s worth noting that Google’s interface is more minimalistic and devoid of some advanced MIUI features, such as geo-blocking or keyword blocking in SMS. However, for basic protection against specific numbers, this is quite enough.

Automatic locking of unknown and hidden numbers

One of the most annoying issues is calling from unknown numbers or when a subscriber hides their ID. On Xiaomi Redmi 6, you can set up a rule that will automatically block any calls if the caller's number is not stored in your phone book. This is a radical but very effective method for those who do not expect calls from couriers or strangers.

To activate this function, go to the lock settings and find the "Block Unknown Numbers" or similar switch. Once activated, all calls from numbers that are not in the contacts will be ignored by the system. In the call log, they may appear as missed or blocked, but the phone will not call.

The No ID lock works a little differently, because it doesn't transfer the number technically, and the MIUI blacklist settings have a separate "Block Hidden Numbers" switch that needs to be activated, which will help protect against particularly persistent collectors or scammers using special services to hide the number.

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If you are waiting for an important call from an unfamiliar number (for example, a courier or a doctor), temporarily disable the Not from Contacts lock so as not to miss the connection.

If you use taxi services or delivery frequently, completely blocking unknown numbers can be a inconvenience, as couriers often call from mobile or city numbers that you do not have in the saved ones.

Use of third-party applications for filtering

Built-in tools are sometimes not enough, especially if you want smarter identification of Caller ID or crowdsourcing of the number base, in which case Redmi 6 can install specialized applications such as GetContact, Truecaller or Yandex.Number Definition. These applications have huge databases, replenished by users themselves.

Once you install this app and give it the rights to manage your calls, it takes over the filter function, so when you get a call, the app checks the number against its database, and if the number is labeled as "Spam" or "Ads," it automatically resets the call, which allows you not just to block specific numbers, but entire categories of nuisance calls.

However, third-party solutions have privacy nuances: To work effectively, these apps often request access to your phone book, which means transferring contacts to third parties.

⚠️ Note: Installing multiple number detectors at the same time can lead to application conflict, which may cause the phone to stop ringing at all or not work correctly.

In addition, some antivirus packages, such as those from Kaspersky or Dr.Web, also contain anti-spam modules. If you already have such an antivirus installed on Xiaomi, a separate application for blocking may be redundant, since the functionality is often duplicated.

Solution and additional settings

Even after you set up the lock, users may encounter situations where calls continue to arrive or, on the contrary, redundant ones are blocked. Often the problem is that the number is saved in contacts with different formats (for example, +7 and 8).

Another common problem is that there are no notifications for blocked calls. If you want to know who called you but don't want to hear the call, check the Security or Phone app's notification settings. In MIUI, lock notifications are sometimes grouped or hidden if Do Not Disturb mode is enabled.

Also worth mentioning is the Child Mode feature or guest mode, where number locking may work differently. If you handed over your phone to your children, make sure they don't remove numbers from the blacklist. For full warranty, you can set a password to log in to lock settings through the Application Protection section of the security menu.

Regular updates to MIUI are also important, as Xiaomi is constantly improving its call algorithms and closing vulnerabilities that spammers may have exploited.