Xiaomi room detector: how to turn on and configure in 5 minutes

Do you get calls from unknown numbers and want to know who is calling before you answer? Xiaomi smartphones have a built-in number detector, but it is not always activated by default. This feature helps identify incoming calls from banks, delivery services, scammers and even individuals — if their numbers are in the database. However, many users do not know how to turn it on correctly or why it suddenly stopped working after the MIUI update.

In this article, we’ll look at all the ways to activate the determinant on any Xiaomi model, from the budget Redmi to the flagship Xiaomi 14 and Black Shark. You’ll learn how to configure the built-in feature through the phone’s menu, what third-party apps can add to it, and what to do if the determinant does not show the names of subscribers. And also – why sometimes the name is displayed as “Spam” or “Fraudster”, and how to fix it.

What is a number detector and how does it work on Xiaomi

The number detector is a service that matches an incoming phone number with a database of names and organizations. On Xiaomi smartphones, it is integrated into the standard Phone app and uses several sources:

• 📱 Local Contact Database – Names from your phone book.
• 🌐 Xiaomi Cloud Services – Data from Other Users MIUI, who marked the number as “Spam” or listed the name of the subscriber.
• 🏦 Official databases of organizations – numbers of banks, public services, courier services (for example, SDEC, Yandex.Eda).
• ⚠️ Fraudulent Numbers – Automatically Blocks Suspicious Calls.

It’s important to understand that the Xiaomi determinant doesn’t work as accurately as specialized applications like GetContact or Truecaller. It relies on data that the company collects through MIUI, so some numbers can appear as “Unknown” even if they are in public databases, but the built-in feature does not require additional programs to install and does not consume traffic on background checks.

How to enable the number detector through Xiaomi settings

The easiest way to activate the feature is through the phone's standard menu. The instructions are suitable for all devices on MIUI 12/13/14, including the Redmi Note 12, POCO X5, Xiaomi 13T and other models.

1. Open the Phone app (the tube icon on the home screen).
2. Click on three dots in the upper right corner (⋮) and select Settings.
3. Go to the Definition of Number and Spam section (some firmware may call Caller Identification).
4. Activate the number definition switch (should turn blue).
5. Below, turn on the option to Show Contact Names and Block Spam.

If you have MIUI 14 or older, you may need additional confirmation to access cloud databases. Click Allow when you request Xiaomi Cloud data. The identifier will start working immediately, and the next call you make will see the subscriber's name (if it is in the database).

Is the "Number Definition" switch on in the phone settings

Is access to Xiaomi Cloud allowed (if requested)

Is the phone app updated to the latest version?

Reboot your smartphone after the changes-->

⚠️ Note: Some models (e.g. Redmi) 9A or POCO M3) The determinant function may be disabled by default due to firmware limitations for budget devices. MIUI Up to the latest version or use third-party apps.

Why the Definition Doesn't Work: 5 Common Reasons

If you have enabled the feature but the subscriber names are still not displayed, the problem may lie in one of the following factors:

Critical feature: On smartphones with MIUI for Russia (RU firmware), the detector works only with numbers in the format of +7 or 8. If the call comes from an international number (for example, +375 for Belarus), the name may not appear even when the function is turned on.

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If the detector stopped working after the MIUI update, reset the Phone application settings. Go to Settings → Applications → App Management → Phone → Warehouse → Clear the data. This will not delete your contacts, but reset the determinant cache.

Third-party applications for numbering

If you don't like the built-in identifier on Xiaomi, you can use alternative services, they offer a wider number database, but they require installation and can collect data about your calls.-3 tested applications:

• 🔍 Truecaller is the most popular solution with a database of billions of numbers, the free version shows names and blocks spam, but contains ads.
• 📞 GetContact – specializes in identifying individuals (shows names that other users have added.
• 🛡️ SberCall is a Russian service from Sberbank, which recognizes bank and public service numbers well. Plus: it does not require registration if you have a Sbera card.

To install any of these applications:

1. Download it from the Google Play Market or Mi App Store.
2. When you first start, give access to contacts and a call log.
3. In the application settings, activate the option “Determining incoming calls”.
4. Make the application standard for calls: go to Settings → Applications → By default → Phone App and select the installed determinant.

⚠️ Note: Apps like Truecaller and GetContact upload your contacts to their servers to replenish the database. If this is critical for privacy, use them in read-only mode (no contacts synced) or prefer the built-in Xiaomi determinant.

How to set up a blocking spam calls

Xiaomi's number detector not only shows names, but also automatically blocks suspicious calls, a feature called Spam Protection that relies on a system-wide database of fraudulent numbers to activate it:

1. Open the phone → Settings → Number definition and spam.
2. Turn on the Spam Block switch.
3. Click on Lock Settings and select the level of protection: Low – blocks only explicit spam (crooks, robots); Medium – adds blocking of advertising calls; High – blocks all numbers not saved in contacts (risk of missing an important call!).

Blacklist.

Once set up, all blocked calls will be displayed in a log marked “Spam” or “Blocked.” To view the list of blocked numbers, go to Phone → Magazine → Spam. From there, you can unlock the number if the call was mistakenly labeled as fraudulent.

The number detector on Xiaomi with two SIM-map

If your smartphone supports two SIM-Cards (e.g. Redmi Note 11 Pro)+ 5G Xiaomi 12T), The number detector will work the same for both lines, but there are a few nuances:

• 📶 Different operators: If one SIM The other one is from MTS and the other one is from Tele2, and the spam number database may be different.
• 🔄 Priority: Subscriber name will only be shown if the number is in Xiaomi database or in contacts. SIM, a contact is saved for the first, the name may not appear.
• ⚙️ Settings for each SIM: Spam Blocking is set up separately for each card. Switch between them in the Settings menu → SIM-maps and mobile networks.

To synchronize contacts for both SIMs:

1. Open the Contacts app.
2. Press three points (⋮) and select Settings → Imports/Exports.
3. Export contacts from the first SIM, then import them to the second.

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On smartphones with two SIM-The number detector works independently for each line, but uses a shared Xiaomi Cloud database. If it is important for you to see subscriber names on both cards, make sure that contacts are synchronized.

Frequent questions about the number determinant on Xiaomi