Blocked call on Xiaomi Redmi: how to unlock and configure

When a caller can't reach you and you don't see an incoming call, it often causes panic. On Xiaomi and Redmi smartphones with MIUI or HyperOS shells, this problem is more common than on other devices. It's usually not a SIM card failure or network failure, but the software settings that are wrong.

Android gadget owners often accidentally activate the Do Not Disturb feature or add a number to a blacklist without noticing it themselves, and the cause can also be an application conflict or a malfunction of the telephony system module. In this article, we will discuss in detail all possible causes and ways to eliminate them.

You don't have to be an IT expert to fix this bug, but we'll go through everything from simple settings checks to more complex manipulations of the engineering menu, and the key is to act consistently so you don't knock down important network parameters, and let's look at why your phone is silent when it should be ringing.

Checking the “Do Not Disturb” regime and statuses

The first thing to rule out are software restrictions that you might have enabled by accident. Xiaomi smartphones have a handy Do Not Disturb mode that blocks all incoming notifications and calls except for selected contacts. Check the status of this mode in the control center.

To do this, swipe down from the top edge of the screen to open the notification curtain. Find a crescent icon. If it's illuminated or active, tap it to deactivate. It's also worth checking your schedule settings, as mode could have turned on automatically on the timer.

Another reason for the phone's silence could be the status of "On the Net" or "Invisible" in messengers or profile system settings. Make sure that in contacts you are not labeled as locked for yourself or for certain individuals. Sometimes a simple reboot of the device that resets temporary errors of the communication module helps.

💡

Use Google Assistant or XiaoAI by simply saying “Switch off Do Not Disturb” if you’re afraid of getting confused in the menu.

Pay attention to the sound profile. In some cases, users set a No Sound or Vibration profile with complete inbox disregard, which is visually similar to locking. Check the audio settings in Settings → Sound and Vibration.

Setting up a blacklist and antivirus

The second most common reason is the built-in antivirus and call blocker settings, and the MIUI security system has powerful features to protect against spam, which sometimes works too aggressively, and can block calls from unknown numbers or even from all subscribers.

To check these settings, look for the Security app on your desktop (a green shield icon). Select the Lock or Antispam section inside the menu, and you'll see a list of locked numbers and filtering rules.

• 📱 Click on the gear in the corner of the screen to open the lock settings.
• 🚫 Check the “Black List” item – it may have accidentally turned out to be the right contact.
• 🔇 Make sure you don’t check “Block all incoming” boxes».
• 📞 Check the locking settings for hidden numbers.

Pay special attention to the "Block Unknown Numbers" rule, which is active, and calls from numbers that aren't in your phone book won't come to the screen, which is a useful feature for combating advertising, but it can be a problem if you're waiting for a call from a courier or a doctor.

⚠️ Note: If you have added a number to the blacklist incorrectly, it may take a few seconds to delete it from the list.

Working with two SIM-map

Many Redmi and Poco models support two SIM cards, and conflict between them is a common cause of missed calls. The system may try to make a call through one SIM while the incoming one goes to the other, and because of the switching settings, the call is blocked or reset.

Go to the Settings menu → SIM-It's important to check which SIM card is the default for voice calls. If you have the "Always Ask" option, the phone can behave unpredictable when an incoming call is made, if you're actively using the Internet on the second SIM.

Try temporarily disabling the second SIM card in your settings and have someone call you, and if the problem is gone, it's a network conflict or data roaming settings, and check if the outbound call limit for a particular SIM card is worth it.

In some cases, resetting your network settings helps, and it won't delete your photos or apps, but it will return your communication settings to factory settings. → Connection and sharing → Reset Wi-Fi, mobile networks and Bluetooth.

Third-party applications and conflicts

If you've installed number-detection apps, ad blockers, or third-party smart calls, the problem may be in them, often requiring deep permissions and can intercept call management when it's not working properly.

Think back to when the problems started. If you install a new software, try removing it, especially when you have applications that promise to "improve connectivity" or "record conversations to the cloud."

It's also worth checking the permissions for the standard Phone app. Go to Settings → Apps → All apps → Phone → Permissions. Make sure that contacts, microphone and phone are allowed. Without that, the system call won't work.

Engineering menus and hidden codes

For advanced users, it is possible to check the redirect status through the engineering menu, sometimes users activate the forwarding of all calls to voicemail or another number, forgetting about it.

Open the call app and dial ##4636##. If the menu opens, select Phone Information. Here you can see the connection status and network type. USSD-operator code.

*#21# - Checking the forwarding status of all calls


##002# - Cancel all redirects (universal code)




*#67# - Redirection status when occupied

Entering ##002# and pressing the call button will reset all the redirect settings on your number, a secure operation that often solves the “locked call” problem if it was the operator settings activated from the phone.

⚠️ Warning: Do not change the settings in the Engineering menu (Phone Information section) unless you know what the specific setting is for. 4G/LTE.

Resetting and extreme measures

If the software methods didn't work, there may have been some critical errors in the system, and the last step before you go to the service center is to completely reset your settings, and remember, this will delete all the data from your phone.

Before the procedure, be sure to back up your contacts and photos to Google’s cloud or computer. then go to Settings → About Phone → Reset → Erase all data.

• 🔄 Make sure the battery is above 50%.
• ☁️ Check for backup in akka!unt Mi Cloud.
• 🔌 Do not interrupt the reset process even if the phone is getting stuck.

💡

A full reset eliminates 99% of the program errors associated with blocking calls, unless the problem is a physical failure of the communication module.

Once turned on, the phone will be like new. Don't install all the apps at once. First, check if incoming calls pass. If so, install programs one at a time to find the culprit.

Frequently Asked Questions (FAQ)