Have you seen a notification about blocked call on your smartphone screen and don’t understand what it means? Or did outgoing calls marked “blocked” suddenly stop going through? This problem occurs on Androiddevices from different manufacturers - from Samsung i Xiaomi to Google Pixel and budget models. In most cases, it is not associated with hardware malfunctions, but with settings of the system, operator or installed applications.

In this article we will look at all possible reasons call blocking - from basic SIM card restrictions to hidden Android functions that few people know about. You will learn how check the blocking status in 30 secondswhat settings are responsible for filtering calls, and what to do if the problem occurs after updating the firmware. And also - how to distinguish a system block from the actions of a mobile operator or viruses.

Spoiler: in 70% of cases, the solution takes less than a minute and does not require contacting a service center. But there are also complex scenarios - for example, when the blocking is related to IMS profile (VoLTE/VoWiFi technology) or a conflict of rights Telecom Service. We will also analyze them step by step.

What does “blocked call” mean on Android

The term "blocked call"** na Android can mean two fundamentally different situations:

  • 📵 An incoming call does not reach you - the subscriber hears beeps, but there is no notification on your screen (or a lock icon appears).
  • 📞 Outgoing call does not go through - after dialing the number, the status “Blocked” or “Call is not possible” is immediately displayed.

In the first case, blocking is usually configured manually (via a blacklist, filter applications or operator). In the second, the problem is often related to system limitations: a disabled communication module, errors IMS or conflicts of rights. Less commonly, hardware faults are to blame (for example, damage to the antenna path after a fall).

Key point: if you see a notification "Call blocked" after dialingit is almost always a problem on your side. If blocking occurs before connecting (the subscriber does not hear beeps), the operator or the recipient may be to blame.

📊 Have you encountered blocked calls on Android?
Yes, incoming messages did not reach
Yes, outgoing messages did not go through
No, but I want to know for the future
I don’t know what it is

Reasons for blocking calls: from basic to complex

Let's look at all the possible reasons in order - from the most obvious to the exotic. Start checking from the first point and move down until you find your situation.

1. Blocking at the SIM card or operator level

Mobile operators can restrict outgoing/incoming calls for several reasons:

  • 💳 Insufficient funds on your account (even if you have unlimited, sometimes international calls are blocked).
  • 📄 Tariff restrictions —for example, a ban on calls to short numbers or roaming.
  • 🔒 Activated service "Antispam" or "Protection from fraudsters" (can block not only spam, but also legitimate numbers).
  • 🛡️ Temporary blocking for suspicious activity (for example, mass SMS).

How to check: call the operator’s short number (for example, *111# for MTS, *100# for Beeline) or use your personal account. If even this call does not go through, the problem is definitely on the operator’s side.

💡

If you have a dual-band SIM card (for example, for iPhone i Android), try moving it to another device. Sometimes the blocking is due to incompatibility between the card profile and the phone model.

2. Blocking settings in Android itself

Modern versions Android (starting from Android 9 Pie) have built-in tools for filtering calls. They can work automatically:

  • 📱 Black list in the phone settings (path: Settings → Applications → Phone → Blocking numbers).
  • 🤖 Do Not Disturb function** (mode DND) with call filter enabled.
  • 🔍 Automatic spam detection (enabled by default on Google Pixel and some Samsung).
  • 👥 Restrictions for specific contacts (for example, “Only favorites” in call settings).

The function "Spam filtering"** is especially insidious - it can block numbers that Google or the smartphone manufacturer is considered suspicious, even if you did not add them to the blacklist. You can check it in the application settings. blocking applications Telephone (chapter Spam and protection).

3. Conflicts with blocking applications

If you installed third-party applications for filtering spam (for example, Truecaller, Kaspersky Who Calls, Hiya), they could block calls using their own algorithms. And sometimes this happens without notifications —you simply will not see the incoming call.

How to check:

  1. Open the settings of the blocker application and look at the log of blocked calls.
  2. Temporarily disable the application or delete it (after rebooting the phone).
  3. Check whether the number has been added to the blacklist inside applications.

Please note: some banking applications (for example, SberBank Online or Tinkoff) can also block calls from suspicious numbers for security purposes. This often happens after application updates.

4. Problems with the communication module or firmware

If all outgoing callsare blocked, but incoming calls are received, the problem may be related to:

  • 📡 Disabled mobile communication module (for example, after resetting the settings).
  • 🔄 Failure to work IMS (technology for VoLTE/VoWiFi).
  • 🐞 Firmware errors after updating (especially relevant for Xiaomi, Realme and other brands with an aggressive update policy).
  • 🔧 Incorrect APN settings (access points).

How to diagnose:

  1. Try turning it on/off Airplane mode for 30 seconds.
  2. Check whether mobile communications is enabled in the settings (Settings → Network and Internet → Mobile network).
  3. Make sure that the correct operator is selected (not “Manual”, but “Automatic”).
  4. If possible, insert the SIM card into another phone - if the problem persists, the operator is to blame.
How to check the IMS status on Android?

Open the engineering menu (type ##4636##), select “Phone Information” and look at the status IMS Registration". If there is "Not Registered", the problem is in the VoLTE settings.

5. data-i="155">It is rare, but there are viruses that block calls to certain numbers (for example, to bank or support service numbers). Usually they are disguised as:

Rarely, there are viruses that block calls to certain numbers (for example, to bank or support service numbers). Usually they are disguised as:

  • 📱 “Battery optimizers” or “Cache cleaners.”
  • 🔋 Applications for saving battery.
  • 🎮 Mods for games (especially if you installed APK from unverified sources).

Signs of infection:

  • Calls are blocked selectively (for example, only to bank numbers).
  • Application appears unknown notifications about blocking.
  • Phone on your own reboots or heats up for no reason.

How to check: run a scan via Google Play Protect (Settings → Security → Google Play Protector install an antivirus (for example, Malwarebytes).

6. Hardware faults

If all software methods did not help, the problem may be:

  • 📶 Damaged antenna (for example, after a fall or moisture).
  • 🔌 Faulty SIM card slot (contacts are oxidized or bent).
  • 🔋 Unstable power supply of the communication module (often happens when the battery is swollen).

In case of hardware problems, they are usually blocked all calls, and not selective. Other functions may also disappear: mobile data, SMS or network detection.

💡

If calls are blocked after physical impact on the phone (drop, water, overheating), with a 90% probability this is a hardware malfunction. Self-repair will not help here - you need diagnostics at a service center.

How to check if your number is blocked by an operator

If you suspect that the blocking comes from a mobile operator, follow these steps:

  1. Call your number from another phone:
    • If you hear beeps, there is no blocking.
    • If it immediately resets or says “Subscriber is temporarily unavailable” - the number is blocked.
  2. Check the balance and status of services:
    • Dial a USSD command to check the balance (for example, *100#).
    • If the balance is negative, top up your account and try again.
  • Check the information with the operator:
    • Call support (numbers: MTS — 0890, Beeline — 0611, MegaFon — 0500, Tele2 — 611).
    • Or write to the support chat through the official application.

      • Please note: operators can block numbers temporarily (for example, due to suspicious activity) or permanently (at the request of law enforcement agencies). In the second case, unlocking is possible only through an official request.

      Call your number from another phone|Check your balance using the USSD command|Check the status in your operator's personal account|Contact support by phone or chat-->

      Step-by-step guide: how to unblock calls on Android

      Now let's move on to practice. Below is a universal instruction that will help you unblock calls in 95% of cases. Start with the first step and move in order.

      Step 1: Check the blacklist and phone settings

      1. Open the application Phone (handset icon).
      2. Click by three dots (⋮) in the upper right corner and select Settings.
      3. Find the section Blocking numbers or Spam and protection.
      4. View the list of blocked numbers. If the desired contact is there, unlock it.

      On some firmware (for example, MIUI on Xiaomi) the path may differ: Settings → Applications → Phone → Call blocking.

      Step 2: Turn off Do Not Disturb mode

      1. Open Settings phone.
      2. Go to section Sound (or Notifications).
      3. Find Do not disturb (DND).
      4. Make sure the mode is off. If on, check the filtering rules calls.

      Please note: Samsung this mode may be called Sleep mode or Relaxation.

      Step 3: Check blocker applications

      1. Open Settings → Applications.
      2. Find in the list Truecaller, Hiya, Kaspersky Who Calls or other analogues.
      3. Open the application settings and look at the blocking log.
      4. If you find a blocked number, unblock it or delete the application.

      Step 4: Reset the network settings

      This will help if the problem is related to APN, IMS or operator conflicts.

      1. Open Settings → System → Reset.
      2. Select Reset network settings (or Reset Wi-Fi, mobile network and Bluetooth).
      3. Confirm the action. The phone will reboot.
      4. After the reboot, check your calls.

    ⚠️ Attention: This reset will delete all saved Wi-Fi networks and passwords for them. Write them down in advance if you do not want to configure them again.

    Step 5: Update the firmware or rollback

    If the blocking appeared after update Android, try:

    • 🔄 Update to the latest version (perhaps a bug has been fixed in the new firmware).
    • 🔙 Roll back to the previous one version (if the update caused the problem).

      • How to update:

      1. Open Settings → System → System update.
      2. Click Check for updates.
      3. If there is a new version, install it.

      ⚠️ Attention: Rolling back the firmware is a complex procedure that can lead to data loss. If you are not confident in your abilities, contact the service center.

      Step 6: Check the SIM card and slot

      1. Turn off the phone and remove the SIM card.
      2. Inspect the card and slot contacts for damage or oxidation.
      3. Clean the contacts with a soft cloth (do not use alcohol or liquids!).
      4. Insert the card back and check calls.

      If the contacts are damaged, replace the SIM card (this is free at the operator's showroom).

      Step 7: Reset the phone to factory settings settings

      This is a last resort if all else fails. All data will be deletedso make a backup copy first.

      1. Open Settings → System → Reset.
      2. Select Delete all data (reset to factory settings).
      3. Confirm the action.
      4. After reboot, set up the phone as new and check calls.

      If after After resetting, the problem disappeared - one of the previously installed applications or settings was to blame.

      Table: Reasons for blocking and solutions

      Reason for blocking Symptoms Solution
      Limitations operator Even calls to the operator's short numbers do not go through Top up your balance, check the tariff, contact support
      Black list on the phone Specific numbers do not reach, the rest are fine Check your phone settings (Phone → Blocking numbers)
      Blocking applications Calls are blocked without notifications, there is a log in the application Disable or delete the application (Truecaller, Hiya etc.)
      IMS/VoLTE failure Calls do not work, but SMS and Internet are available Reset network settings or update firmware
      Viruses Selected numbers are blocked (banks, support services) Scan your phone with an antivirus, remove suspicious applications
      Hardware malfunction All calls do not work, the network disappears Diagnostics at the service center

      Frequent errors when unblocking calls

      Many users aggravate the problem by trying to fix it using the wrong methods. Here's what you can't do:

      • 🔧 Reset your phone without a backup —you will lose contacts, photos and messages.
      • 📱 Delete system applications (for example, Phone or Google Play Services) - this can completely disable the phone.
      • 🔋 Disassemble the phone yourself - without experience, you risk damaging the antenna module or cables.
      • 🔄 Roll back the firmware without instructions - this can lead to a “brick” (complete inoperability) of the device.
      • 💳 Replenish your account with large sums, if you are not sure of the reason for the blocking, first check with the operator.

      It is also not worth:

      • Install unofficial firmware in the hope of fixing the blocking - this often breaks the communication module.
      • Use apps for “hacking” IMEI is illegal and can lead to blocking the phone by the operator.
      • Ignore blocking notifications - they often contain hints (for example, “Blocked” antispam")
      💡

      If after all the manipulations the problem remains, try inserting the SIM card into another phone. If everything works there, your smartphone is to blame. If not, the problem is with the operator or SIM card.

      FAQ: Answers to frequently asked questions

      Can the operator block my number without warning?

      Yes, but only in exceptional cases:

      • At the request of law enforcement agencies.
      • If fraud is suspected activity (bulk SMS mailing, calls to paid numbers).
      • If the number has not been used for a long time (usually after 6-12 months without activity).

      In all other cases, the operator is obliged to notify you in advance (for example, if the balance is negative).

      Why are all incoming calls blocked on my Xiaomi, except favorites?

      This is a firmware feature MIUI. There is a function in the phone settings "Only selected contacts", which by default can be enabled in the mode "Do not disturb" or "Second space".

      How to disable:

      1. Open Settings → Sound and vibration → Do not disturb.
      2. Select Allow calls from and install All contacts.
      3. Check if the mode is enabled Second space (in some versions MIUI it blocks calls for the main profile).
      After the Android update, outgoing calls stopped going through. What should I do?

      This is a typical problem when updating firmware, especially on phones Samsung, Xiaomi i Realme. Reasons:

      • Failure of operation IMS (technology for VoLTE).
      • Conflict of system application rights Telecom Service.
      • Incompatibility of the new firmware with the operator settings.

      Solutions:

      1. Reset network settings (Settings → System → Reset → Reset mobile network).
      2. Disable VoLTE in the SIM card settings (if there is such a switch).
      3. Update the firmware to the latest version (sometimes bugs are fixed in the following patches).
      4. If all else fails, roll back to the previous version Android (skills or help from a service center are required).
      How do I know if my operator is blocking international calls?

      There are several ways:

      1. Check the tariff in your personal account or through a USSD command (for example, *111*0887# for MTS).
      2. Call the test international number (for example, +123456789 is a non-existent number, but the operator must show reason for blocking).
      3. Contact support and check whether the international service is enabled.

      Please note: even if international calls are unblocked, they may not go through to numbers in certain countries due to sanctions or operator restrictions.

      Is it possible to unblock a number if another subscriber has blocked it?

      No, if you have been added to the black list on another phone, you cannot cancel it yourself. However, there are workarounds:

      • 📞 Call from another number.
      • 💬 Write an SMS - sometimes only calls are blocked.
      • 📧 Contact via instant messengers (WhatsApp, Telegram).
      • 🔄 Ask a mutual friend (mutual acquaintance) to convey a request to unblock you.

      If the blocking is at the operator level (for example, through a service "Antispam"), you can contact support with a request to check the status.