How to ban incoming calls from unfamiliar numbers on Android Xiaomi Redmi

Spam calls and intrusive advertising have become a disaster for smartphone owners, and Xiaomi users are no exception. Every day hundreds of subscribers face the problem of constant calls from scammers or automated marketing systems, which is not only annoying, but also disrupting the work rhythm. Fortunately, the Android operating system, in conjunction with the proprietary shell of MIUI or the new HyperOS, offers powerful built-in tools to filter traffic.

Unknown number locks can be installed without installing third-party software, using standard device capabilities. This solution allows you to create a digital shield that will automatically cut calls from numbers that are not in your phone book. In this article, we will discuss in detail the algorithms of actions that will help you forget about calls from unknown subscribers forever.

It’s worth noting that settings may vary slightly depending on the firmware version and the region it’s released for. However, the basic security logic remains the same across all Redmi and Poco models. A deep understanding of these mechanisms will allow you to flexibly manage contacts and ensure your peace of mind.

Use of built-in antivirus and blocker

The most effective and safe way to filter calls is to use a native security application that is preinstalled on every Xiaomi smartphone, which is integrated deep into the system and has access to a database of spam numbers, which allows you to block not only specific contacts, but also entire categories of calls.

Inside the app, you'll find the block section, depending on the version of the MIUI shell, it can be called "Antispam" or "Blocking." That's where the key switch that activates the strict filter mode is located. Once you log in, you'll be offered several options, including blocking hidden numbers and numbers from other regions.

It's important to understand the difference between completely blocking all unknowns and smart filtering. If you turn on "Block All Unknowns" mode, the person who is not in contacts will just hear the beeps or the signal is busy, and you will not even receive notifications, this can be critical if you are waiting for an important call from a courier or doctor whose number you do not already have.

⚠️ Warning: Enabling full lock mode on all unknown numbers may result in missing important calls from delivery, taxi, or emergency services if their numbers are not stored in your book.

To fine-tune it, tap the gear icon or the three-dot menu in the top right corner of the screen, and you can set exception lists by adding important organizations or temporary contacts. Quiet Mode is also available, where the caller hears the beeps, but the phone does not ring or vibrate, so you can avoid missing the call, but you can also be undisturbed.

Set up a blacklist through a standard call

If you prefer an easier path without logging into deep security settings, the standard call app also provides contact management functionality. Open the Phone app (green handset) and go to settings by clicking on three dots or a gear. Here is the "Blocked Numbers" item, which allows you to manually manage the list of unwanted contacts.

In this section, you can activate the option "Block Unknown Numbers." This feature works locally on the device and does not require a connection to cloud databases, which ensures high speed of processing the incoming call. The system instantly checks the number with your phone book and, if there are no matches, interrupts the connection.

• 📞 Open the Phone app and go to settings.
• 🚫 Select "Blocked Numbers" or "Antispam".
• 🔒 Activate the switch to Block Unknown Numbers".
• ✅ Add important numbers to the whitelist if necessary.

The feature of the blacklist on Xiaomi is that it allows you to log blocked calls, and even if the call is rejected automatically, you can see who tried to reach you in a separate tab of the lock log, which is useful for analyzing spammer activity and deciding whether to put specific numbers on the permanent blacklist.

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Check the blocked call log periodically to make sure the system does not block important calls from new contacts or services that have changed numbers.

Working with the "Do Not Disturb" and "Sleep" modes

An alternative way to combat late-night spam or intrusive calls during working hours is to use concentration modes, which are called Do Not Disturb (DND) and Sleep Mode on Android, which allow you to flexibly adjust the rules of call passage, leaving the phone available only to select contacts.

To set up, go to Settings → Sound and Vibration → Don’t Disturb. You can create a schedule where the phone automatically switches to quiet mode, such as 23:00 to 07:00 or 09:00 to 18:00 on business days. In this mode, be sure to select Calls and set the value of Contacts Only or Favorites Only.

This approach differs from full lockdown in that calls from unknown numbers don't reset immediately, just don't sound. You'll see a missed call when you unlock the screen, but the phone won't vibrate or ring, ideal for those who want to keep control of the situation but don't want to be available 24/7.

Use of third-party applications and databases

Despite the power of embedded tools, more advanced filtering based on crowdsourcing databases is sometimes required: Applications like Truecaller, Yandex with a number or Kaspersky Who Calls can identify not just an “unknown number”, but a specific organization or type of fraud, and they label calls as “Advertising”, “Banks”, “Couriers” or “Fraudsters”.

Integration of these services with Xiaomi system occurs through obtaining permissions to access the phone and contacts. Once installed, the application can automatically detect an incoming call and, if the number is marked as spam by other users, either silently drop it or mark it with red, which allows you to make a decision about whether to pick up the phone or not, based on the experience of the community.

However, installing third-party software requires permissions. Number-detection apps often require access to your entire phone book and call history, which can be privacy-critical. Always check what data the app collects and to whom it is shared before giving full access.

For MIUI users, there is a possibility to configure integration. In some regions, you can select a database provider in your anti-spam settings. If you don't have one, the third-party application will work in parallel to intercept calls. It's important not to create a conflict when two apps are trying to process the same call, which can cause a malfunction of the phone.

⚠️ Note: When installing third-party number identifiers, carefully review the privacy policy, as you may unknowingly transfer your contacts to open databases.

Blocking Hidden Numbers and International Calls

A separate category of problems are calls from a hidden number (when the number is displayed as a “Hidden number” or “Unknown”) and international spam. Blocking hidden numbers at the operator level is often impossible without paid services, but at the level of a Xiaomi smartphone this is solved quite simply.

In the lock settings ("Antispam" or "Black List"), find the option "Block Hidden Numbers". Activating this item will prevent any calls where the subscriber's ID is not transmitted, this is especially important for combating automatic callers who often hide their ID.

For international calls, the “Block International Calls” feature is useful if you are not waiting for calls from abroad and roaming, and enabling this option will prevent you from receiving calls with codes from other countries, which will significantly reduce the level of fraudulent traffic coming often from call centers located abroad.

• 🌍 Go to the call lock settings.
• 🔒 Find the section "Blocking Rules" or "Antispam Settings".
• ✈️ Activate the option to block international or hidden numbers.
• 📝 Save the changes and check the function.

It is worth remembering that blocking international numbers can be inconvenient if you have relatives or business partners abroad, in which case it is better to use softer filters or rely on a database of spam numbers, which will identify the suspicious foreign code itself.

FAQ: Frequently Asked Questions

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The integrated use of built-in anti-spam, Do Not Disturb mode and the careful use of third-party databases provide maximum protection against unwanted calls on Xiaomi Redmi.