Xiaomi smartphones are famous for their versatility and flexible security, but sometimes these security mechanisms are the ones that cause users serious inconvenience. When a subscriber can not reach you and you do not see missed calls, often arises from incorrectly configured filters or default anti-terror functions. Owners of Redmi and Poco devices face this regularly, since the MIUI shell and the new HyperOS have deep traffic filtering settings.
Understanding exactly where the switch that blocks the connection is hiding requires careful study of the phone’s menu. Often the problem lies not in one particular setting, but in a combination of several modes, such as Do Not Disturb and built-in anti-spam. In this article, we will discuss in detail all possible causes of blocking and provide a step-by-step algorithm for eliminating them.
You don't need to be a technician to fix this situation, but you need to check several sections in the Security settings and application consistently, and we'll look at both the standard methods through the interface and the deeper settings that may require attention in complex cases.
Use of the built-in "Security" application
The main tool for managing calls in the Xiaomi ecosystem is the system application Security. This is where the main levers of incoming traffic are concentrated. Often users accidentally activate lock modes without even noticing it, since the icon can be hidden in folders or on the desktop.
To get started, you have to run the app and find the partition that's responsible for communication. The interface may vary slightly depending on the firmware version, but the logic remains the same. You have to find the Blacklist or Lock that's responsible for filtering numbers.
- 📱 Open the Security app (Icon with lightning or shield).
- 🔍 Go to the Antispam or Blacklist section.
- ⚙️ Click on the gear icon in the upper right corner to access settings.
- 🚫 Find the “Block Everything” option and make sure the switch is off.
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If you can’t find the Security app, try searching the system by typing the word “antispam” or “blocking” in the search bar.
Inside the lock settings menu, it’s important to check if the check box on the item that forbids calls from all unknown numbers is worth checking, a feature that is useful for combating telemarketing, but it can also block a call from a courier or doctor whose number is not stored in your contact book.
⚠️ Note: In some regions (e.g. Indonesia), locking functions may be restricted by law or not available in stock firmware, in which case standard methods through the Security app may not work.
Setting up the "Do Not Disturb" mode
One of the most common reasons the phone is silent when incoming is activated Do Not Disturb mode, unlike the blacklist, this mode does not reset the call, but simply turns off sound and vibration, creating the illusion of a complete lockdown.
You can quickly check the status of this mode by lowering the notification curtain, if the moon icon is active, then the mode is working, but for full control you need to go into deep settings to understand the rules of its operation, the system allows you to create schedules when the phone “falls asleep” automatically.
You should go to the Settings menu. → Sound and vibration → Don't bother. It's important to look at the exclusion section here. Even if the mode is active, you can allow calls from selected contacts or repeat calls.
- 🌙 Go to the "Do Not Disturb" settings».
- 📞 Find the section "Allow calls».
- ✅ Choose from “All” or “Contacts Only” if you want to hear from people you know.
- 🔁 Activate the “Repeat Calls” option to avoid missing an urgent call.
Pay attention to your schedule settings. Often, users automatically turn on the mode from 23:00 to 7:00, and then forget about it. If you are waiting for an important call at night, this setting must be temporarily changed or turned off.
Managing a blacklist of contacts
A blacklist is a personalized filter that gets into numbers you have not called you, and the problem can arise if the number was added there incorrectly or as a result of malware that mimics system processes.
To check the list of blocked subscribers, go back to the Security app and select the Blacklist, which displays the log of blocked calls and SMS, you can see who tried to reach you, and unlock the numbers you need.
| Type of lockdown | Wherever | How to turn off |
|---|---|---|
| Manual lockdown | Blacklist | Select a number → Delete |
| Blocking of unknowns | Anti-spam settings | Turn off the "Block Hidden" switch |
| Do Not Disturb mode | Sound settings | Turn off in the curtain or menu |
| Blocking by the operator | Personal Account/USSD | Send the unlock command. |
If you find a number on the list that you didn't plan to block, just click on it and select "Delete" or "Unlock" and then calls from that number will come in as standard.
What if the number is added to the blacklist automatically?
Checking the forwarding settings and operator
Sometimes the reason for the lack of calls is not in the smartphone itself, but in the settings of the mobile operator, and the forwarding service or blocking by the provider can create the effect of “turning off” the phone.
Check if you have an unconditional redirect activated. USSD-Enter *#21# and press the call button. The system will give you information about where your calls are redirected, SMS data.
*#21# - Checking the status of forwarding
#002# - Cancel all types of redirectsIf you see that the redirect is active to an unknown number, immediately cancel it by dialing the code ##002#. Also, you should contact your operator’s personal account (MTS, Beeline, MegaFon, Tele2) to make sure that the number does not hang paid inbox blocking services.
⚠️ Warning: Make sure you have funds in your account.Some operators automatically block incoming and outgoing calls when you have a negative balance or after a long period of non-use of the SIM card.
Resetting the settings of the “Phone” application
In rare cases, a software failure of the call app itself can cause malfunction, cache files may have been corrupted, or settings may have been lost after the system update, in which case the application's factory settings help.
To do this, go to Settings → Applications → All apps. Find the Phone app (usually with a green handset) in the list. Click on it and select “Clean” or “Reset” option.
☑️ Checklist for call diagnostics
This procedure will not delete your contacts or call history, but will return the call settings to their original state. After the reset, it is recommended to restart the device so that the system applies the changes correctly.
Additional methods and advice
If none of these things worked, the problem could be deeper, VoLTE or Wi-Fi Calling settings may conflict, and try temporarily disabling these features in the SIM card and network settings menu.
It’s also worth checking if you have a third-party number-detection app (like GetContact or NumBuster) that intercepts call management, which often has its own spam databases and can block legit calls.
- 📶 Turn off VoLTE in the settings SIM-check-up.
- 🗑️ Remove third-party number detectors.
- 🔄 Update the Phone app via Google Play or GetApps.
- 📲 Check the SIM card on another phone.
In extreme cases, if the problem is only observed on one particular number, ask the subscriber to check if you are not blacklisted by him.
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A comprehensive check of all levels of protection – from operator settings to MIUI system filters – ensures that the cause of the lock is identified in 99% of cases.