How to remove call blocking on Android

There are situations when the phone suddenly begins to ignore incoming calls, dropping them or simply not making a sound signal. The problem of blocking calls on Android can arise for various reasons: from accidental activation of the Do Not Disturb function to third-party blocking applications. Understanding how to remove these restrictions is critical to restoring normal communication. In this article, we will analyze in detail all possible scenarios, from simple settings in the menu to complex network restrictions of the operator.

You may have noticed that subscribers hear short beeps and then reset, or they are immediately transferred to voicemail. These are clear signs that incoming calls are prohibited. Often users enable these features themselves, wanting to protect themselves from spam, but forget to disable them later. We will look not only at the software settings of your smartphone, but also at service commands that can affect forwarding and blocking at the network level.

The first step in diagnostics is checking the basic settings of the device itself. Often the problem lies not in a breakdown, but in the activated silence mode or specific filtering rules. In modern versions Android Call management has become more flexible, but also more confusing for the untrained user. You need to carefully check the section responsible for calls to exclude software blocking.

In some cases, especially after updating the firmware, the settings may disappear or change to default. For example, the feature to block unknown numbers may activate on its own. This creates the illusion that the phone is broken, when in fact it is simply following a command to not allow calls from numbers that are not in your phone book. To remove this blocking, just go to the corresponding menu and uncheck the box.

It is also worth considering that the blocking can be set by the telecom operator itself or through special USSD codes. If your phone settings are fine, but calls still don't go through, the reason may lie in the services connected to your SIM card. Checking these parameters requires entering special commands in the dialer. Below we will describe in detail how to do this without the risk of losing important data.

Checking the standard phone settings and Do Not Disturb mode

The most common reason for missed calls is the activated mode "Do not disturb" (Do Not Disturb). In this mode, the system intentionally mutes sounds, vibrations, and visual notifications, including incoming calls. On many smartphones, this mode can be turned on accidentally by pressing a combination of volume buttons or swiping the quick settings panel. To remove the blocking, you need to disable this mode through the settings or notification panel.

Go to the device settings and find the section related to sound or notifications. Depending on your model smartphone, the path may differ, but the logic remains the same. Find the Do Not Disturb switch and make sure it is turned off. Also check the schedule of this mode: perhaps it turns on automatically at a certain time of day, and you just fell into this interval.

⚠️ Attention: Do Not Disturb may have exceptions. Check your exception settings: perhaps calls are allowed only from contacts from “Favorites”, while other callers are blocked by the system. Make sure that the category of contacts that is important to you has permission to interrupt silence.

In addition to the global silence mode, there are blocking settings for individual contacts. If the problem only occurs with certain numbers, check the contact card in your phone book. There may be a “Block calls” checkbox. To remove this restriction, you need to open the contact, click on the menu (three dots) and select the unlock option. This action will instantly restore the ability to communicate with this subscriber.

However, keywords such as “Block”, “Banning” or “Silence” are usually present in the settings search. Use the search bar in the settings menu by typing “lock” to quickly find the section you need. This will save time and help avoid mistakes when manually searching in deep menus.

Managing a black list and built-in blocking functions

Most modern smartphones have a built-in function black listthat allows you to automatically reject calls from unwanted callers. This feature is useful for fighting spam, but sometimes important numbers end up in the list by mistake or as a result of malware. To remove the blocking, you need to clear this list or remove a specific number from it.

Open the standard “Phone” application and go to call settings. Typically this item is located in the menu hidden behind three dots in the corner of the screen. Find the “Blocking numbers” or “Blacklist” section. Here you will see a list of all numbers that are prohibited from calling you. Highlight the desired number and click the delete button or the trash can icon to remove the ban.

• 📱 Open the Phone application and click on the menu icon (three dots or lines).
• 🚫 Select "Settings" → "Blocking numbers" (or "Black list").
• 🗑️ Find the number in the list and click on the cross or the "Delete" button to remove the block.
• ✅ Check if the "Block unknown numbers" option is active, and disable it if necessary.

Some manufacturers, for example Xiaomi or Samsungoffer advanced filtering settings. There you can block not only specific numbers, but also entire groups, for example, “All hidden numbers” or “All unknown”. If you have the option to block all unknowns enabled, then any subscriber who is not in your address book will not be able to get through. Uncheck this box if you are expecting calls from couriers or new clients.

It is also worth checking the antispam settings if they are integrated into the system. In some regions, antispam protection is enabled by default, which may incorrectly classify legitimate calls as spam. In the blocking settings, find the item related to spam identification and try to temporarily disable it. This will help you understand whether the built-in filter is the cause of the problem.

Disabling blocking via USSD codes and operator settings

Sometimes call blocking is set not on the phone itself, but on the operator’s side. This is called barring outgoing or incoming calls and is controlled through special USSD commands. Such settings are often used by parents to control their children's expenses or by users themselves to protect against unnecessary expenses while roaming. To remove this blocking, you need to enter a special code in the dialer.

The universal code for canceling all types of call restrictions is the command ##002#. Enter it in the Phone application and press the call button. The system will automatically send a request to the operator, and after a few seconds you will receive a notification that all forwarding and blocking have been successfully cancelled. This method works for most operators around the world and is the fastest way to solve the problem.

Blocking type	Shutdown command	Status check command	Description of action
All restrictions	##002#	*#002#	Cancels all types of call forwarding and barring.
Outgoing calls	#33*PIN#	*#33#	Cancels barring on outgoing calls (PIN code from the operator is required).
Incoming calls	#35*PIN#	*#35#	Cancels the bar on incoming calls (PIN code required).
Forwarding	##004#	*#004#	Cancels conditional forwarding (when busy or no answer).

Please note that to disable some types locks may require input PIN code. This is not the PIN you enter when you turn on your phone to unlock the SIM card, but a special code that is issued by your telecom operator (often the last 4 digits of the phone number or a standard code like 0000 or 1234). If you do not know this code, you can find it in your operator's personal account or by calling support.

⚠️ Attention: When entering USSD codes with a PIN code, you have a limited number of attempts. Three incorrect entries can block the service of changing call settings on the SIM card. In this case, only the telecom operator will be able to unlock the function through the communication salon or support service.

If the code ##002# did not help, perhaps your tariff has specific restrictions. Log into your operator's application or your personal account on the website. In the “Services” or “Tariff” section, check for active options such as “Anti-identifier”, “Parental control” or “International call barring”. Disabling these options through the app interface is often more reliable than using USSD commands.

Third-party applications and antiviruses: searching for hidden blockers

Often, users install third-party applications for number identification or anti-spam protection, such as Truecaller, Yandex.Phone or various antiviruses with a firewall function. These apps have their own databases and blocking algorithms that work regardless of system settings. If you have removed all system restrictions, but calls are still blocked, the culprit may be such an application.

Go to the phone settings, the “Applications” section, and find the installed blockers. Open the settings of each of them and find the “Blacklist” or “Call Blocking” section. Check to see if aggressive filtering is enabled there. Often such applications have a “Block everything except contacts” function, which can be activated by default after updating the spam database. Remove this setting or add important numbers to the application whitelist.

In some cases, the application itself may not work correctly, freezing and intercepting calls. Try temporarily uninstalling the blocking application and check if the connection is restored. If after removal the problem disappeared, then that was the problem. You can install it again, but with softer settings, or choose an analogue with a better reputation.

Why does an antivirus block calls?

Some antiviruses have an “Anti-theft” or “Privacy Protection” function, which can block calls from numbers not included in the trusted list. Check the “Privacy” section in your antivirus settings.

It’s also worth checking application permissions. Go to Settings → Applications → Special. access → Access to notifications or a similar section. Make sure the phone app has all the necessary permissions. Sometimes after an update Android permissions are reset, and the third-party blocker stops processing incoming messages correctly by simply resetting them.

Resetting network settings and re-registering the SIM card

If software methods did not help remove the blocking, the problem may lie in the network settings. Failure to register a SIM card in the operator’s network may result in the network “not seeing” your phone or considering it inaccessible to incoming calls. In this case, an effective solution is to reset the network settings. This action will return the APN, Wi-Fi and Bluetooth settings to factory defaults, but will not delete your personal data (photos, contacts).

To perform a reset, go to section Settings → System → Reset settings. Select "Reset Wi-Fi, mobile data and Bluetooth settings." Confirm the action. After the reboot, the phone will re-register in the operator’s network. This process may take several minutes. During this time, the network icon may disappear and appear again.

• 🔄 Restart your smartphone to initiate reconnection to the cell tower.
• 📡 Remove the SIM card, wipe the contacts with a soft cloth and insert it back.
• ⚙️ Reset the network settings through the Android menu.
• 📞 Try calling your number from another phone to check.

Another important point is to check the operation of the SIM card in another device. Move your SIM card to another phone. If the blocking persists, then the problem is definitely on the side of the operator or the SIM card itself (for example, it is damaged or blocked for non-payment). If calls are normal on another phone, then the problem is in the hardware of your smartphone or its firmware.

⚠️ Attention: After resetting the network settings, you will have to re-enter passwords for saved Wi-Fi networks and re-pair Bluetooth devices (headphones, watches). Make sure you remember passwords for important networks before performing this operation.

In rare cases, manual network selection helps. Go to Settings → Connections → Mobile networks → Telecom operators. Turn off automatic selection and wait for your phone to find available networks. Select your operator manually. This will force the phone to re-register with the home network, which can remove false blocking that occurs during roaming or a tower failure.

Radical measures: reset to factory settings

When none of the above methods did not help remove call blocking, the last software method remains - a complete reset of the device to factory settings (Hard Reset). This will erase all data from your phone, including apps, photos, and settings, returning it to a store-like state. This step is justified only if you are sure that the problem is not on the operator’s side or in a physical breakdown of the communication module.

Before performing a reset, be sure to back up all important data to the cloud or to your computer. Then go to menu Settings → System → Reset settings → Delete all data (factory reset). Confirm the action and wait for the process to complete. The phone will reboot and you will have to set it up again. On a clean system without third-party applications, call blocking should disappear if it was caused by a software glitch.

If the problem persists even after a full reset, there is a high probability of a hardware failure. This could be damage to the antenna, failure of the radio module, or problems with the SIM card connector. In such a situation, software methods are powerless, and the only solution is to contact a service center to diagnose and repair the equipment. Do not try to disassemble the phone yourself if you do not have experience, so as not to aggravate the damage.

Frequently asked questions (FAQ)

Why can’t I remove call blocking if I forgot the PIN code from the operator?

If you entered the wrong PIN code three times to manage blocking services (not to be confused with the SIM card PIN), the function is blocked. In this case, you need to contact your operator's support service or visit a phone shop with your passport. Only the operator can reset this code and restore the ability to manage services via USSD.

Can call blocking occur due to a virus?

Yes, malware can set up forwarding to paid numbers or block incoming calls to hide its activity. If you suspect a virus, scan your phone with a reliable antivirus, remove suspicious applications and reset your network settings. In difficult cases, only a full reset to factory settings will help.

What to do if you are blocked only on certain numbers?

Most likely, these numbers accidentally ended up in the blacklist of your phone or in the spam database of a third-party application. Check your blocking settings in the Phone app and installed antivirus software. It is also possible that the subscribers themselves have blocked you on their part - in this case, you will not be able to do anything from your device.

Does airplane mode affect call blocking?

Airplane mode completely disables all wireless modules, including cellular communications. In this state, incoming calls are not possible and the caller hears that the phone is switched off or unreachable. Make sure the airplane icon in the notification shade is not active. This is the most common, but common reason for “blocking”.

How can I find out if my number is blocked by the operator for non-payment?

Try calling someone yourself. If outgoing messages also do not go through, and there are no network icons on the screen (or there is a prohibition icon), check your balance. If the balance is zero or negative, operators often block outgoing and sometimes incoming calls. Top up your account and wait 5-10 minutes for automatic unlocking.