Annoying calls from spammers and scammers have become a real scourge of the modern smartphone user. The situation is especially annoying when attacks are carried out en masse: the same operator or bot farm calls thousands of subscribers, changing only the last digits in the number, but leaving the prefix or area code unchanged. Manually blocking each individual contact in this case turns into a Sisyphean task, which does not bring relief, since tomorrow you will receive a call from a neighboring number from the same series.
Fortunately, the ecosystem Android offers quite flexible tools to solve this problem, allowing you to filter out unwanted calls at the system level or using third-party software. In this article, we'll take a closer look at how to set up incoming call filtering so that your phone is silent when the familiar set of numbers that indicate spam appears on the screen. We will look at the built-in functions of different shells, the capabilities of specialized applications, and even hidden engineering menus.
Before moving on to specific actions, it is important to understand the principle of mask blocking. Unlike blocking a specific subscriber, this method requires more fine-tuned settings, since the system must analyze the incoming data stream and compare it with a given pattern. Masking numbers is a powerful tool that saves your time and nerves, but requires proper configuration so as not to accidentally block important calls from delivery services or couriers, whose numbers may also fall into common patterns.
Built-in capabilities of the standard "Phone" application
Most modern smartphones running pure Android or proprietary shells from Samsung, Xiaomi i Realmehave built-in anti-spam mechanisms. However, the functionality of blocking by prefix (the beginning of the number) is often hidden in the depths of the settings or is only available in certain firmware versions. The standard application Phone usually allows you to block specific contacts, but to work with groups of numbers you need to look for the “Black List” or “Call Blocking” section.
In some implementations, for example, in the shell MIUI or ColorOS, it is possible to create blocking rules. You can set a condition under which a call will be rejected if the number begins with a certain sequence of characters. To do this, you need to go to the call settings, find the item Blacklist and select the mode for adding a rule. Here the system will prompt you to enter a pattern, using special characters or simply indicating the starting numbers that should be eliminated.
⚠️ Attention: The settings interface may vary significantly depending on the version of Android and the manufacturer of your device. If you do not find the “Block by beginning of number” item in the standard menu, this does not mean that the function is unavailable - perhaps it is implemented through a third-party application from the manufacturer or requires a software update.
It is also worth noting that built-in filters often work in conjunction with spam databases. Automatic detection unwanted numbers can work more effectively than manually setting the mask if the attack is carried out constantly changing prefixes. However, for static attacks, when calls are made, for example, from all numbers in the range +7 (999) 000-XX-XX, manually setting the beginning of the number remains the most reliable method.
Before setting up hard filters, be sure to check whether the numbers of your friends, colleagues or services that you regularly use start with these numbers. to avoid missing important calls.
Use of third-party applications for advanced filtering
When the capabilities of standard software are not enough, specialized applications from the store come to the rescue. Google Play. The leaders in this niche are solutions like Call Blocker, Should I Answer? or Calls Blacklist. These apps provide much more flexible tools for managing incoming traffic, allowing you to create complex blocking rules that are not available in stock applications. One of the key advantages of such utilities is support for masks. You can set a rule that will block any numbers starting with “8800”, for example, if you do not want to receive calls from federal marketing centers, or from a specific area code that often receives fraudulent calls. The setup process is usually intuitive: you create a new rule, select the “Starts with” type and enter the required numbers.
One of the key advantages of such utilities is support regular expressions and masks. You can set a rule that will block any numbers starting with “8800”, for example, if you do not want to receive calls from federal marketing centers, or from a specific area code that often receives fraudulent calls. The setup process is usually intuitive: you create a new rule, select the “Starts with” type and enter the desired numbers.
- 📱 Flexibility of settings: Ability to block not only by the beginning of the number, but also by length, the presence of certain numbers in the middle or end.
- 🛡️ Spoofing protection: Some applications analyze behavioral factors and can block numbers that masquerade as local numbers, but have hidden signs of spam.
- 📊 Statistics and logs: Maintaining a detailed log of blocked calls so that you can check at any time who tried to call and, if necessary, add the number to the white list.
The system Android will request access to manage calls and contacts. Without granting rights READ_PHONE_STATE and the ability to end calls, the app will not be able to physically hang up the call, even if it detects a match with the mask. Therefore, when setting up for the first time, carefully read the system requests and confirm the issuance of rights.
Setting up blocking masks in popular launchers
Users of devices from Chinese manufacturers often have access to advanced security features right out of the box. Shells MIUI (Xiaomi, Redmi, POCO), Funtouch OS (Vivo) and OriginOS integrate powerful security modules that allow you to manage the blacklist at a deep level. In these systems, blocking by prefix is implemented through the “Antispam” or “Security” menu.
Let's consider the algorithm of actions using the example of devices Xiaomi. You need to open the application Security, go to the section Antispam and click on the settings icon (gear). In the “Black List” menu, select the option to add a number and note the ability to select the type of blocking. There is often an item “Block by prefix” or similar, where you can enter, for example, the first 4-5 digits of the number.
Similar logic works in smartphones Samsung with a shell One UI, although the interface may be less obvious. In the application Phone click on the three dots in the corner, select Settings, then Blocking numbers. Some versions of the software have the “Block unknown numbers” function, but to block by mask you may need to use an application Good Lock with a module Call Assistantthat allows you to create custom filtering rules.
| Manufacturer / Shell | Path to settings | Mask support | Additional functions |
|---|---|---|---|
| Xiaomi (MIUI/HyperOS) | Security → Antispam → Settings | Yes (full) | SMS blocking, hidden numbers |
| Samsung (One UI) | Phone → Settings → Blocking | Limited (via Good Lock) | Smart sorting, spam protection |
| Realme (Realme UI) | Phone manager → Blocking | Yes | Do not disturb mode, smart answer |
| Pure Android (Pixel) | Phone → Settings → Blocked | No (specific ones only) | Google spam filter, name detection |
⚠️ Attention: Operating system updates may change the menu layout or remove some functions. If you do not find the described items, check the official help for your specific model or update the Phone application via Google Play.
Advanced methods: USSD codes and operator services
Sometimes it is more effective to combat spam not at the smartphone level, but on the side of the cellular operator. Major market players (the Big Four in the Russian Federation and similar operators in other countries) provide Antispam services that filter calls before they reach your SIM card. This is especially true for cases when you need to block entire ranges of numbers belonging to marketing agencies.
Operator services often allow you to configure personal black list directly in your personal account or through the operator’s mobile application. Some tariffs include the ability to block calls from certain codes or short numbers. To activate such functions, you usually use USSD commands or special applications from the telecom operator that are integrated into the contact system.
*110*771# - Example command for activating the service (depending on the operator)The advantage of the network level of blocking is that your phone does not receive an incoming call signal at all, which means that battery power is not wasted, and you are not bothered by the screen lighting up at the wrong moment. However, it is worth considering that such services are often paid or available only within certain tariff plans. In addition, the operator cannot always block the prefix; most often the blocking is based on specific numbers from the spam database.
Can the operator block the entire range of numbers?
Usually operators block specific numbers from the “grey” lists. Mass blocking of entire prefixes (for example, all numbers starting with 999) is possible only at the request of government authorities, since these numbers may also include law-abiding subscribers.
Technical nuances and working with area codes
When setting up blocking by starting digits, it is critical to understand the structure of telephone numbers. In international format, the number begins with a country code (for example, +7 for Russia and Kazakhstan, +380 for Ukraine), followed by an operator or region code. An error in determining the mask can lead to you blocking calls from an entire city or from all subscribers of a certain telecom operator.
For example, if you decide to block all numbers starting with +7 495, you will stop receiving calls from any subscribers and organizations in Moscow using landline or mobile numbers with this code. Therefore, before entering the mask into the application settings, analyze where exactly the unwanted calls are coming from. Spammers often use mobile codes (for example, 900, 999, 8800 for federal lines), which are safer to block entirely than geographic city codes.
Another important aspect is the format for storing numbers in the phone's memory. Some applications compare the incoming number with the mask strictly by characters. If you specified 8900in the mask, and the call arrives in the format +7900, the filter may not work. It is recommended to use the most universal format or configure the rules so that they ignore the country code, focusing on the operator code and the first digits of the subscriber number.
- 🌍 International format: Always consider the country code when creating a mask, especially if you are traveling or receiving calls from abroad.
- 🔢 Mask length: The shorter the mask (fewer numbers), the higher the risk of blocking legal numbers. It is optimal to use the first 4-6 significant digits after the country code.
- 🔄 Input format: Check whether the application requires the input of a "+" sign or allows the use of "8" instead of the country code.
Accuracy The mask settings directly affect the effectiveness of the protection: a mask that is too short will block unnecessary people; a mask that is too long will let through spammers who change the last digits.
What to do if an important call was missed
Even with the most careful settings, there is a risk that an important call will fall under the filter. This could be a call from a courier whose number belongs to a corporate PBX with a common prefix, or from a government service. Therefore, the blocking system must have a White List mechanism, which takes precedence over any blocking rules.
Regularly review the blocked call log in the application you use for filtering. Most quality apps keep logs of all rejected calls. If you see an important number there, immediately add it to exceptions. In some cases, it is worth creating a separate contact for important services and assigning a special ringtone to it so that you can identify the call even if it passes through the filters in vibration mode.
It is also recommended to periodically review your blocking rules. Spammers constantly change tactics: today they call from one prefix, and tomorrow they switch to another. What worked a month ago may not be useful today. Flexibility and attention to detail are the key to a successful fight against telephone terrorism.
⚠️ Attention: Never block emergency services (101, 102, 103, 112) and short service numbers of banks, even if you have received suspicious calls from them. Most likely, this was a number substitution (spoofing), and not a real call from the organization.
FAQ: Frequently asked questions about blocking numbers
Is it possible to block numbers that hide their number (Anti-AON)?
Blocking hidden numbers is possible on almost all smartphones. In the Phone app settings or blacklist options, look for the option to “Block hidden numbers” or “Block unknown numbers.” This will reject any call that does not send a caller ID. However, be careful: doctors from the clinic or employees of some organizations may call this way.
Why do they still continue to call me after blocking the prefix?
This can happen for several reasons. Firstly, spammers can use number substitution technology (spoofing), changing not only the last digits, but also the entire prefix. Secondly, you may have specified the mask incorrectly (for example, you did not take into account the country code). Thirdly, some operators transmit the number in a non-standard format that does not match your mask. Try to shorten the mask to the first 3-4 digits after the country code.
Does installing blocking applications affect the speed of the phone?
Modern call blocking applications are optimized and work in the background, using a minimum amount of resources. They are activated only at the time of an incoming call to check the number against the database. This has virtually no effect on the speed of the interface or other applications. However, old or poorly written apps may consume excess battery power.
How to unblock a number if I accidentally added the wrong prefix?
Go to the application or settings where you created the blocking rule. Find the “Blacklist” or “Blocking Rules” section. Your created template (mask) will be displayed there. Click on it and select "Delete" or "Edit" to correct the numbers. After this, calls from these numbers will go through again.
Does prefix blocking work for SMS messages?
Depends on the specific application. Many advanced blockers (for example, Calls Blacklist) allow you to apply the same masking rules for both voice calls and SMS. In the settings of such an application, you need to check the box next to the “Block SMS” item for the created rule. Standard Android tools often share these settings.