Constant calls from intrusive spammers, debt collectors or simply unfamiliar callers can unsettle any smartphone owner. This issue is affecting millions of users around the world, disrupting their workflow and personal peace. The issue is especially acute for those whose phone number is included in the databases of unscrupulous marketing agencies.
Fortunately, a modern operating system Android provides a wide range of tools for filtering incoming calls. You don't have to be an advanced user to set up protection. In this article we will analyze in detail all available methods: from built-in dialer functions to installing specialized software.
We will also consider the nuances of working with different versions of the interface, such as One UI from Samsung or pure Android from Google. You will learn how to distinguish system settings from the functions of the telecom operator and what pitfalls can be expected when completely blocking all unknown contacts.
Built-in blocking functions in the standard “Phone” application
The simplest and most effective way to limit access for unwanted callers is to use the standard capabilities of your “dialer”. Most modern smartphones already have a pre-installed filtering mechanism, which is often hidden deep in the settings menu. To get started, open the application Phone.
Click on the three vertical dots in the upper right corner of the screen to bring up the context menu. In the list that appears, select Settings. Here you will need to find the section responsible for call management. Depending on the device model, it may be called "Number blocking", "Antispam" or "Call barring".
Activate the switch opposite the option "Block unknown/hidden numbers". Once you enable this feature, all calls coming from numbers not stored in your phone book will be automatically rejected. The subscriber will hear a busy signal, and you will not receive any notification about the missed call.
⚠️ Attention: Enabling total blocking of unknown numbers may result in you missing an important call from a courier, doctor or employer whose number you have not yet managed to save. Use this feature with caution.
Please note that the interface may differ on different devices. For example, on smartphones Xiaomi the path may look like Settings → Antispam → Blacklist. On devices Samsung often you need to go to Settings → Blocking numbers and manually add a blocking mask.
Before activating the full blocking unknown numbers, warn your colleagues and loved ones that they must save their number in your contacts, otherwise it will be impossible to reach you.
Using the “Do Not Disturb” mode to filter calls
An alternative and more flexible method is to use the "Do not disturb" (Do Not Disturb) mode. This tool allows you not just to block calls, but to set up complex rules for letting calls through depending on the time of day or category of the caller.
Go to the main settings of your smartphone and find the section Sound and vibration. Inside it, select the item "Do not disturb". Here you can configure the schedule for the mode or activate it manually. The key point is in the subsection Calls and messages.
In the parameter "Allow calls from" select the option "Contacts only". When Do Not Disturb mode is active, your phone will ignore all incoming calls from numbers that are not in your address book. The caller will hear beeps, but your phone will not ring or vibrate.
- 📱 The mode allows you to create exceptions for selected contacts who can get through even in silence.
- ⏰ You can set filtering to turn on automatically at night or during meeting hours.
- 🔇 Visual notifications about missed calls will still appear in the notification shade.
The advantage of this method is its temporary nature. You can turn on protection only when you really need silence, without changing the global blocking settings for the entire phone book.
Third-party applications to protect against spam and scammers
If the built-in tools are not enough, specialized applications from the store come to the rescue Google Play. These apps have extensive databases of numbers, which are replenished by the users themselves, which allows them to detect spam with high accuracy.
One of the market leaders is the application Kaspersky Who Calls or Yandex.Phone. Once installed, they ask for permissions to access your call log and contacts. This is necessary to check the incoming number with the internal database of the service.
The application can operate in two modes: spam warning or full automatic blocking. In the first case, the message “Probably spam” will appear on the screen, and you can decide for yourself whether to pick up the phone or not. In the second mode, the call is dropped automatically without your participation.
| Application name | Blocking type | Internet requirement | Feature charges |
|---|---|---|---|
| GetContact | Identification and blocking | Required | There is a free version |
| NumBuster | Automatic reset | Desirable | Shareware |
| Call Blocker | Blacklist by mask | Not required | Free |
| Truecaller | Global spam database | Required | Subscription for premium |
Read carefully privacy policy before installation.
Why do applications require access to contacts?
Applications use your contacts to identify numbers. When someone calls you, the app checks to see if the number is in other users' databases and flags it as "Pizza Delivery" or "Scammer."
Carrier services to block unwanted calls
Mobile carriers also offer network-level anti-spam solutions. This means the call is blocked before it even reaches your smartphone, saving battery power and data. Such services are usually paid, but often have a trial period.
To activate the service, you need to go to your operator’s personal application or send a USSD command. For example, the operator MTS service is called “Antispam”, the Beeline is called “Spam Protection”, and the MegaFon service is called “Antispam”. Tariffs and conditions may vary depending on the region.
The operator's system analyzes the incoming call flow and checks the numbers against its own blacklist. If a number is marked as spam, the call will be disconnected and you may receive an SMS notification about a connection attempt. Some operators allow you to configure protection levels through your personal account.
⚠️ Attention: Operator services may conflict with third-party applications. If you use both at the same time, false positives or, conversely, unwanted calls may be missed. It is recommended to choose one main method of protection.
The advantage of the network level of protection is that it works even on feature phones or smartphones without anti-virus software installed. This is a universal solution for all devices registered in the network of a specific operator.
☑️ Connecting the service with the operator
Manually creating a black list and blocking by mask
Sometimes it is necessary to block not all unknown people, but only a specific group of numbers, for example, those starting with a specific code city or prefix. To do this, use the blocking function by mask or manually adding to the blacklist.
In the blacklist settings of your smartphone, find the option "Add number". In some firmware, for example on the base MIUI or ColorOS, you can use the asterisk symbol as a substitute for numbers. For example, mask +7999 block all numbers starting with this code.
If your standard dialer does not support masks, you can add specific numbers manually. Open the call log, click on the unwanted number and select Block. This number will be added to the system blacklist and will no longer be able to reach you.
For more advanced users, it is possible to use ADB commands to deeply configure blocking, but this requires developer rights and a connection to a computer. For the average user, the functionality of the settings menu is sufficient.
adb shell pm grant com.android.phone android.permission.READ_CALL_LOGRemember that manually maintaining a blacklist requires time and attention. This method is effective against specific stalkers or intrusive organizations, but is useless against mass robotic spam that constantly changes numbers.
Mask blocking is a powerful tool, but use it carefully so as not to accidentally cut off your access to calls from the desired region or from the mobile numbers of a certain operator.
What to do if they call from a hidden number (No Name)
A separate category of problems are calls from hidden numbers when the screen displays the words “No name” or “Hidden number”. Standard blocking of “unknowns” (those who are not in your contacts) often does not work here, since the system does not see the number itself for verification.
To combat such calls, you need to use special settings in the call menu. Find the item "Additional settings" or More in the phone application. There may be an option "Reject hidden numbers" or "Anonymous calls".
If there is no such option in the smartphone menu, the only solution is to contact your telecom operator. Most large providers have an “Anonymous Call Barring” service, which is activated on the network side and does not require settings on the phone.
- 🚫 Hidden numbers are often used by scammers and debt collectors to avoid feedback.
- 📞 Activating protection against anonymous calls can block calls from some institutions (for example, hospitals or government agencies) that use old ones PBX.
- ⚙️ On some models Samsung this function is hidden in the section
Settings → Blocking numbers → Block anonymous calls.
It is important to check the relevance of the settings after each major update of the operating system. Developers Android periodically change the menu layout and names of functions, so the usual path may become irrelevant.
⚠️ Attention: Complete blocking of hidden numbers will make it impossible to receive calls from emergency services or individuals who fundamentally hide their number for security reasons.
Frequently asked questions (FAQ)
Will the caller see that I have blocked him?
Usually a blocked subscriber hears long beeps, as in a normal call, after which the connection is reset. It does not receive a special message about blocking, but by the nature of the beeps (one long one and then reset), an experienced user can guess about the blocking.
Is it possible to block unknown numbers on a dual-SIM phone?
Yes, the settings are applied individually for each SIM card. You need to go to call settings and select the appropriate SIM card to activate blocking for it. The parameters are not automatically duplicated between slots.
Will SMS messages be received from blocked numbers?
Blocking calls does not always mean blocking SMS. In standard Android settings, messages from blocked contacts often end up in a separate Spam or Blocked folder, but they can also end up in your main inbox. For complete protection, you need to configure SMS filtering.
Will blocking calls reduce battery consumption?
Yes, slightly. The phone spends less resources on incoming call processing, vibration and screen backlighting if the call is rejected automatically at the system or application level. However, the operation of background blocking applications can, on the contrary, consume energy.
How to unblock a number if I accidentally added it to the black list?
Go to the settings of the “Phone” application, select the “Black list” or “Blocked numbers” section. Find the desired contact in the list and click on the trash can icon or cross next to it to remove it from the block list.