When an important call fails to arrive and a subscriber hears a short beep or reset, many smartphone owners are familiar with the situation. Often the reason lies in the randomly activated blacklist function, which blocks unwanted calls. On Xiaomi and Redmi devices running the MIUI shell or the new HyperOS, ban management is implemented in a flexible but sometimes confusing way.
Owners often don’t know where to look for lock settings, as they can be scattered across menus or hidden in system security applications. There are three main levels of lock: system (through call settings), security, and carrier level, and understanding this hierarchy is critical to successful communication recovery.
In this article, we will discuss all possible methods of deregulation in detail, we will look at standard system tools, work with redirect codes and the nuances of blocking by cellular operators. Follow the instructions carefully to ensure that you can return calls from the right contacts.
Checking system lock settings in MIUI
The first thing to do is make sure that the number is not locked by the built-in operating system. In Xiaomi and Redmi smartphones, the standard Phone app or the Security system unit is responsible for this. The interface may vary slightly depending on the firmware version, but the logic remains the same.
Open the Phone app and find the gear icon or the three-dot menu at the top of the screen. In the list that appears, select Settings, then go to Lock. This shows the full list of no-go numbers. If you see a contact you want, just click on it and select Unlock or swipe it off the list.
Sometimes users forget to turn on the "Block Unknown Numbers" feature, which automatically rejects calls from numbers that aren't in your phone book, check if the switch is activated in the same lock settings menu, and if so, deactivate it to receive calls from all subscribers.
⚠️ Note: If you use a third-party call (like Google Phone or Truecaller), the settings may be inside the app itself, not in the Xiaomi system menu.
You can use the engineering menu codes for a deeper check, but on modern versions of MIUI they are often blocked by the manufacturer. So the main emphasis should be on the graphical interface of settings. Make sure that there are no individual restrictions on the contact card for a particular contact.
Use of the Security App
The central element of access control in Redmi and Xiaomi smartphones is the system application “Security”, which is where all the rules for filtering calls and calls are aggregated. SMS-If you can't find the settings on a standard call, this is the most likely solution.
Run the Security app with a green shield icon, search and open the Antispam or Lock section, and this section has the Blacklist tab, and you click on it and you'll see a list of all the contacts and numbers that have been blocked, and you can set up rules, like locking all the hidden numbers or numbers from other regions.
To unlock a particular subscriber, find their number on the list, click on it and select the Delete button or the basket icon. Once confirmed, the number will be removed from the blacklist, and calls will again come to the device.
- 📱 Open the Security app on the home screen.
- 🛡️ Go to the “Antispam” or “Blocking” section».
- 📞 Select the “Black List” tab and find the desired number.
- 🗑️ Click on the number and select “Delete” or “Unblock».
Importantly, the Security app can update its spam databases automatically. If a number was blocked as spam, it could be automatically listed, and checking this section regularly will help avoid missing important calls in the future.
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Periodically check the lock log in the Security app to make sure important numbers don’t get there mistakenly due to aggressive spam filters.
Unlocking the lock through USSD-codes and settings SIM
Sometimes the problem lies not in the smartphone itself, but in the redirect or lock settings at the level of the device. SIM-Operators provide services to block unwanted numbers that can work regardless of the phone settings. USSD-code.
Codes may vary depending on the operator (MTS, Beeline, MegaFon, Tele2 and others), so the exact combination is better clarified on your operator's official website. However, there are universal commands to check the status of the lock. Enter the command in the dialing field and press the call button. The system will respond with a message about the status of the service.
**#43# - Checking the status of forwarding (universal code)
##002# - Disable all types of redirects (universal code)If you have previously activated services such as Anti-Number Detector or Blacklist through the operator, simply removing the contact on the phone will not be enough. USSD-For example, to disable paid blocking services often requires the entry of a cancellation code.
| Operator. | Status check | Disabling the lockdown | Menu team |
|---|---|---|---|
| MTS | *111*442# | *111*442*0# | Services → Blocking |
| Beeline | *110*771# | *110*771*0# | Settings → Prohibitions |
| Megaphone | *105*12# | *105*12*0# | Services → Blacklist |
| Tele2 | *120*26# | *120*26*0# | Services → Blocking |
Once you enter the disable command, you will receive a confirmation SMS. If the code does not work, the service may already be disabled or the command is outdated, in which case the most reliable way is to contact the operator's support team or use the operator's mobile application.
⚠️ Attention: Use USSD-Make sure you are on the home network or charging outgoing calls/teams correctly to avoid unexpected costs.
Do Not Disturb Mode Settings
A common cause of missing calls is Do Not Disturb, which doesn’t block the number permanently, but temporarily hides notifications and interruptions, and on Xiaomi, it has advanced settings that can be confusing.
Go to Settings → Sound and Vibration → Don't disturb. Check if this mode is on. If it's active, look at the "Exceptions" or "Allow Calls" section, and you can set up who can reach even quietly: all contacts, favorite contacts, or no one.
Also check the Do Not Disturb schedule, which may be activated automatically at a certain time of day or when you are in a certain location (geolocation), and if your important call came in at that time, the phone may have silently ignored the call unless the number was added to the exception.
☑️ Checking the “Do Not Disturb” regime»
There's also a Pocket Mode or Pocket Mode feature that can block screen and calls if the proximity sensor is closed. While it's not exactly a blacklist, the effect is similar - you don't see the incoming call. Make sure the protective film on the screen doesn't override the sensor at the top of the display.
Third-party applications and antiviruses
If standard MIUI tools do not solve the problem, you should pay attention to installed third-party applications. Antiviruses (for example, Kaspersky, Dr.Web, ESET) and number determinants (GetContact, NumBuster) often have their own blacklist databases that work on top of the system.
Go to the settings of each antivirus or application installed to determine the number. Find the section "Antispam", "Block" or "Blacklist." If the number you want is there, delete it. Often these applications update their databases automatically, and the number may be marked as spam by other users.
Special attention should be paid to applications that require access to calls and contacts, which have priority in processing incoming calls. If you do not use such programs constantly, consider removing them or temporarily disabling them to check if they are the reason for blocking.
Why is the number marked as spam?
What to do if the number is permanently locked
In rare cases, a number may be locked at the hardware or account level if it is a corporate phone or a lost device. If the phone was lost and marked as missing through Find My Device or Xiaomi Cloud, it can be remotely locked, in which case only the owner of the account to which the device is associated can unlock.
There is also the concept of a “name lock” on the part of the operator in the event of loss. SIM-If you've changed your cards. SIM-card, but left the old number, make sure the new one SIM-The card is active and has no limitations, sometimes it helps to simply restart the device after retrieval and re-installation. SIM-map.
If none of the software methods worked, and you're sure that the number is not blacklisted by either you or the operator, there may be a problem on the caller's side, his number may be hidden, or he is in a networkless zone, try calling him from another phone to rule out a malfunction of your network.