The situation where a blocked call becomes an obstacle to communication is familiar to many smartphone owners: the device can restrict communication with a particular subscriber, hide a number or completely block outbound traffic due to system errors. Owners of Xiaomi, Redmi and POCO often encounter this in the shell of MIUI or the new HyperOS.
The reasons for this behavior range from accidental activation of the Blacklist to more serious problems with the network settings of the operator. Sometimes the user sets the limits himself, forgetting them, and in other cases requires interference with system parameters. Understanding the source of the problem is the first step to restore full communication.
In this guide, we will go into detail all possible lock scenarios, learn how to manage your contact list, set up antivirus filters, and use engineering codes to reset restrictions, and unlocking often takes only a few minutes if you know where to click.
Diagnostics: Why the call doesn't go through
Before you start active actions, you need to determine exactly the type of lock. A blocked call can manifest itself in different ways: the beeps go, but no one picks up the phone, or you immediately hear the signal “busy.” In Android, a separate module is responsible for processing calls, which can conflict with the operator’s settings.
A common cause is activated Do Not Disturb. In this mode, Xiaomi automatically rejects all incoming contacts except favorite ones. It is also worth checking whether the flight mode is on or the minutes limit on the SIM card is not exhausted. SIM-The cards can also simulate a lock.
⚠️ Note: If after resetting the call settings the problem persists on all numbers, it is possible that the lock is set at the level of the operator or the device itself is in the blacklist on the Internet. IMEI.
For an accurate diagnosis, try calling from another phone to your number and vice versa. If incoming ones pass and outgoing ones don't, the problem is in the tariff or outbound identification settings. If incoming ones don't pass, look for the reason in the software filters of your smartphone.
Managing the Blacklist in the Phone application
The most common scenario is that the number was accidentally blacklisted, and in the MIUI and HyperOS shell, lock management is built right into the standard Phone app, which is a handy tool, but it requires careful adjustment of rules.
To check the list, open the call app and click on the three dots or gear icon in the corner of the screen. Select Settings or Antispam. Here you will see the Blacklist section where all blocked contacts are stored. Having a number on this list means that a blocked call from that direction will be rejected automatically.
- 📱 Open the Security (Green Shield) app to access the advanced antivirus and blocker settings.
- 🚫 In the Blacklist section, you can add a number manually or select from a call history.
- ⚙️ Set up lock rules: Hidden numbers, all unknown or only selected contacts.
Deleting a contact from the list takes seconds. Just click on the number and select Delete or the basket icon. After that, you can unlock the number instantly and calls will start coming back. Don't forget to also check the SMS Lock tab, as the rules are often synchronized.
☑️ Checking the Black List
Set up the “Do Not Disturb” mode and priorities
Do Not Disturb mode is often confused with full lock, but its function is different - it restricts notifications and calls at certain times. If you only have a blocked call at night or on weekends, this is likely the mode that is activated. At Xiaomi, it has flexible priority settings.
Go to Settings → Sound and vibration → Don’t disturb. You can set your schedule so that your phone doesn’t automatically go into that mode. It’s also important to check “Allow Calls.” If it selects “No One” then the phone will be silent, creating the illusion of a lock.
⚠️ Warning: Turning on Do Not Disturb mode can hide calls even from contacts from the phone book unless exceptions are set up for select subscribers.
To access these features quickly, use the control panel (curtain). There is a button with the image of the moon. Make sure that it is not active (does not burn). If you want certain people to be able to reach you always, add them to the favorites list in contacts and allow calls only from them in the mode settings.
Hidden Repeat Call Settings
Use of the USSD-operator codes and commands
Sometimes the software settings of the smartphone are not involved, and the blocked call is initiated at the network level. USSD-These commands work on any phone, including Redmi and POCO.
Use universal codes to check forwarding and blocking statuses, enter them in the dialing field as a regular call, for example, code #43# shows the status of the call waiting, and ##002# cancels all types of forwarding, which often helps if the call "flies" to another number without your knowledge.
| Team team. | Description of action | The result |
|---|---|---|
| *#43# | Checking the status of waiting for a call | It shows whether the service is active. |
| #43# | Disabling call waiting | The second call will be dropped. |
| ##002# | Resetting all redirections | Calls will stop going to other numbers. |
| *#31# | Checking the concealment of the number | It shows if your number is visible to the subscriber. |
If you receive a runtime error message or “code is not valid” after entering the code, contact your carrier’s support team.Perhaps the lock service is connected on the server side and requires specialist intervention or input. PIN-code.
Reset network settings and call parameters
When simple methods don't work, a deeper approach is needed: Resetting your phone's settings returns all your phone settings to factory values without affecting your personal data (photos, contacts, apps) is an effective way to eliminate the software glitch that causes a blocked call.
To perform the reset, go to Settings → Apps → All Apps. Find the Phone app (or Calls) in the list, click on it and select Clean → Reset. After that, the phone can reset. It's also worth resetting the network settings: Settings → Connection and Sharing → Reset Wi-Fi, mobile networks and Bluetooth.
- 🔄 Resetting the settings of the Phone application clears the history of lock settings within the application.
- 📡 Network reset updates access points and registration parameters in the operator’s network.
- 🔌 Removal and re-installation SIM-Cards help to update registration on the network.
After these procedures, be sure to restart the device. If the blocked call was caused by a software conflict or an error in the network configuration, the problem should disappear. Make sure that after the reset, the Phone application has all the necessary permissions in the Permissions menu.
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Before resetting your network settings, write down passwords from Wi-Fi networks, as they will be deleted from the device’s memory.
Third-party applications and system conflicts
Xiaomi owners often install third-party number detectors such as Truecaller, NumBuster, or antiviruses like Kaspersky and Dr.Web. These apps have their own databases and filtering rules that can override system settings. If you have a blocked call from a specific person, check if it is marked as spam in such programs.
Go to the settings of the installed antivirus or number detector. Find the "Block" or "Blacklist" section. Often, a user accidentally clicked "Block" on an incoming call, and the number flew to the application base, deleting from there completely unlocks the contact.
⚠️ Note: Conflict between system blocker MIUI And third-party applications can lead to double blocking or, conversely, to the skip of unwanted calls.
It’s also worth checking if there’s a parental control app or enterprise software that can restrict communication, which often has hidden settings and can block calls at specific times or from specific numbers without notifying the user.
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If you use third-party number detectors, make sure they have permission to manage calls, but don’t duplicate the system blocker features to avoid conflicts.