How to block contact on Xiaomi Redmi 9: all ways with pictures

You can block a harassing interlocutor or spam number on Xiaomi Redmi 9 in 30 seconds if you know where to look for the right settings. Unlike iPhone or “pure” Android, Xiaomi smartphones offer several ways to block: through the standard Phone application, the contact menu, and even through MIUI Security (if installed), each method has its own nuances: for example, blocking through the call log is not always synchronized with Messenger, and a blacklist in MIUI can be reset after updates.

In this article, we have 3 proven ways to block contacts on Redmi 9 (relevant to MIUI 12, 13 and 14), including hidden features that are not mentioned in the official documentation. Also, we will discuss how to check if the number is actually blocked, and what to do if the lock is not working. Importantly, on Redmi 9 with firmware below MIUI 12.5, the lock via “Security” may not persist after the reboot, as even Xiaomi warns in its official notes.

1. Blocking through the application “Phone” (the fastest way)

This method works on all versions of Redmi 9 (including Redmi 9A/9C/9T) and does not require additional applications, the main advantage is that blocking is applied to all communication channels: calls, SMS and messages in the standard Messages application.

Instructions:

• 📱 Open the Phone app (the tube icon on the home screen).
• 🔍 Go to the Journal section and find the number you want to block. Click on it.
• ⚙️ In the contact window that opens, tap three points (⋮) in the upper right corner and select Block the number.
• ✅ Confirm the action in the pop-up window. the number will be added to the blacklist automatically.

If the contact is already saved in the phone book, the algorithm is slightly different.

1. Open Contacts. → Find the right profile.
2. Click on the contact name → Edit (pencil icon).
3. Scroll down and select Additional → Block this contact.

The number disappeared from the call log | When you try to call, you hear the "busy" signal | SMS from this number do not come | Contact is marked as blocked in the settings-->

⚠️ Attention: Redmi 9s MIUI 12.0.x The blocking via the “Phone” does not apply to messengers (WhatsApp, Telegram.

2. blacklist in MIUI settings (extended options)

If the first method didn’t work (for example, the number is still called), use the built-in blacklist in the system settings, which is more reliable because it blocks the number at the firmware level, rather than the application.

How to add a number to the blacklist:

1. Open Settings → Applications → Number Blocking (or Blacklist in older versions of MIUI).
2. Click Add to Blacklist → Select From Contacts or enter the number manually.
3. Activate the switches to block Calls and Messages.
4. Save the changes with the Ready button.

Features of this method:

• 🔒 The lock works even if the number is not saved in the contacts.
• 📵 Entire number prefixes can be blocked (for example, all numbers with a code). +7999*).
• ⚙️ V MIUI 14 Block Unknown Numbers – included in the same menu.

💡

If the blacklist is reset after the MIUI update, check the sync settings in your Xiaomi account (Settings → Xiaomi Account → Sync → Blacklist).

Blocking through MIUI Security (for advanced users)

The MIUI Security app offers advanced tools to block not only numbers, but also spam messages, phishing links and even suspicious applications, a method that is suitable if standard methods have not worked.

Step-by-step:

1. Open the Security app (shield icon).
2. Go to Block or Protect against Spam (name depends on the version of MIUI).
3. Select Blacklist → click + in the upper right corner.
4. Enter the number manually or select from the contacts/call log.
5. Specify the type of lock: 📞 Calls. 💬 Communications 🌐 Internet fraud (for the purpose of SMS referenced)

Save the changes.

Advantages of this method:

• 🛡️ Not only does it block calls, but it also blocks calls. SMS link-in.
• 🔄 You can set up automatic deletion of messages from blocked numbers.
• 📊 Statistical of blocked attempts (useful for tracking spammers).

⚠️ Note: Redmi 9 with custom firmware (e.g. Pixel Experience) MIUI Security can conflict with system services, in which case use standard locking methods or third-party applications like Truecaller.

4.How to check if a number is locked on Redmi 9

A common problem is that the user blocks the number, but the calls keep coming in.

• 🔄 Resetting settings after update MIUI.
• 📱 Doubles. SIM-Cards (blocking only applies to the main card) SIM).
• 🤖 Application conflict (for example, if Truecaller is installed along with a standard lock).

How to make sure that the number is actually blocked:

1. Ask a friend to call from a locked number, and you should hear a "busy" or short horn.
2. Check the call log – no blocked numbers are displayed there (except MIUI 14, where they are marked in gray).
3. Open Settings → Lock numbers and find the number in the list.
4. Send an SMS to a locked number – the message should not arrive (or a notification about the blocking appears).

Using the Phone app | Through MIUI settings | Through MIUI Security | App side (Truecaller, etc.) | I do not block numbers-->

5 What to do if the lock is not working

If after all the manipulations the number continues to bother you, check these points:

If nothing helps, try resetting your network settings:

1. Open Settings → About the phone → Reset settings.
2. Select Network Settings Reset (does not reset data, only network settings).
3. After the reboot, repeat the number lock.

💡

On the Redmi 9 with two SIM-The default lock card applies only to the main card. SIM. To block the number on both cards, repeat the procedure for each card separately.

6. Third-party applications for blocking (if standard methods do not help)

If the built-in MIUI tools don't work (like blocking spam bots on WhatsApp), use specialized apps.The best options for Redmi 9 are:

• 🛡️ Truecaller – determines spam numbers from the database, blocks SMS Minus: requires access to contacts.
• 🔒 Hiya is a lightweight blocker with minimal resolutions. MIUI.
• 📵 Should I Answer? – analyzes incoming calls in real time, supports the Russian-language spammer database.
• 🤖 Blacklist Plus – allows you to create blocking rules for keywords in the SMS.

How to set up a lock in Truecaller:

1. Download the app from the Play Market.
2. When you first start, allow access to Contacts, Call Log and SMS.
3. Open the menu (⋮) → Settings → Lockdown.
4. Activate options: 📞 Block spam calls 💬 Block spam-SMS 🔍 Display notifications about blocked calls (optional).

My blacklist.

⚠️ Note: Apps like Truecaller send your contacts to their servers to create an anti-spam database. If critical, use Hiya, which works locally.

7. How to unlock a number on Redmi 9

If you accidentally block the desired contact or the spammer changes the number, it takes no more than a minute to unlock the number, and the methods depend on the method by which you block the number:

Through the Phone app:

1. Open the phone. → ⋮ → Settings → Number locking.
2. Find the number in the list and swipe it to the left (or click on the basket).
3. Confirm removal.

Through MIUI settings:

1. Go to Settings → Applications → Lock numbers.
2. Tap the room. → Choose Remove from the blacklist.

Through MIUI Security:

1. Open Security → Blocking → Blacklist.
2. Hold your finger on the number → press Delete.

Frequent Questions (FAQ)