How to throw an emergency on an Android phone

Spam calls and annoying messages from strangers have become a real problem for owners of modern smartphones. Constant notifications interfere with work, leisure and may pose a potential threat of fraud. Fortunately, the operating system Android provides powerful built-in tools for filtering incoming traffic.

The blocking procedure may vary depending on the version of the shell and the model of your device. In this article we will analyze in detail all the available methods, from standard functions to using third-party utilities. You will learn how to permanently remove a contact from the allowed list and regain silence.

Black list is an effective barrier that not only hides notifications, but completely interrupts the connection. After activating this function, the caller will hear short beeps or a busy message, and you will not see any traces of his activity.

Blocking through the standard Phone application

The fastest way to restrict access to an unwanted caller is to use the built-in dialing menu. This method works on most devices with “clean” Android and shells from Samsung, Xiaomi or Realme.

Open the application Phone and go to the “Recent” tab. Find the number you want to block from the list. Press on it and hold your finger for a second to bring up the context menu.

• 📞 Select “Block number” or “Add to blacklist”.
• 🚫 Confirm the action in the pop-up window by clicking “OK” or “Block”.
• 📂 Alternatively, click on the "i" icon next to the number and select the block option in the contact details.

After completing these steps, the number will be entered into block list. It is important to understand that some carriers may display call status differently for a blocked caller. In some cases, the caller may hear standard beeps, although the call will not go through.

⚠️ Attention: If you block a number that was mistaken for spam, but which turned out to be important (for example, a courier or a doctor), you can only unblock it manually through the settings.

Setting up a black list through the Contacts menu

If the number is already saved in your phone book, the blocking procedure can be performed directly through the contact card. This is convenient when you need to block a friend or organization whose data you already have.

Go to the application Contact and find the desired entry. Open complete information about a person. In the upper right corner of the screen there is usually a menu with three dots or a gear.

Click on this icon and find the item "Block". The system may ask for confirmation, since this action is irreversible without intervention in the settings. On some models Google Pixel this option is duplicated by a button directly in the contact profile.

It is worth noting that blocking through contacts often automatically extends to SMS messages from this subscriber You will stop receiving any notifications from it, which ensures complete digital isolation.

Use of operator codes and USSD requests

Not all users know that blocking can be done at the level of the cellular operator. This is especially true if you have changed your phone, but want to keep the list of unwanted numbers active.

Each major operator (MTS, Beeline, Megafon, Tele2) has its own USSD commands or services for creating an “Anti-identifier” or “Blacklist”. These services are often paid or require connection through a personal account.

Operator	Service name	Team activation	Cost
MTS	Black list	*111*442#	3 rub/day
Beeline	Black list	*110*771#	Paid
Megafon	Black list	*558#	Paid
Tele2	Black list	*220#	Paid

The use of operator tools ensures that the call will not reach your device even if the phone is turned off or there is no network. However, managing such a list often requires sending SMS or entering complex commands.

⚠️ Attention: Tariffs and operator codes may change. Before activating the service, be sure to check the current conditions in the official application of your telecom operator or on the website.

Advanced settings in the "Spam Protection" section

Modern versions Android (starting from 9.0 and higher) are equipped with advanced filtering systems, which are often integrated with the database Google. These functions allow you to block not only specific numbers, but also entire categories of calls.

To access these settings, go to the application Phone, click on the three dots in the corner and select Settings. Next, find the section Caller ID and spam or Blocking numbers.

Here you are you can activate the switch "Filter spam". The system will automatically identify suspicious numbers from the database and reset them without your participation. There is also an option to block all calls from unknown numbers that are not saved in your book.

How does the Google database work?

Google analyzes millions of user reports of spam. If a number is flagged by many people as fraudulent, the system will mark it in red or block it automatically if the appropriate setting is enabled.

The use of built-in protection algorithms significantly reduces the load on the processor and battery compared to third-party applications. This is native functionwhich works in the background and does not require additional permissions.

Use of third-party applications for blocking

If standard tools are not enough, specialized apps from the store come to the rescue. Google Play. Applications such as Truecaller, Call Blocker or Mr. Numberoffer advanced functionality.

They allow you to create complex blocking rules, for example, prohibit calls from numbers starting with certain numbers, or hide calls during certain hours of the day. Some of them have their own huge databases of spam numbers.

• 🛡️ Truecaller: market leader with the largest database of spam numbers and call recording function.
• 📵 Call Blocker: simple interface and the ability to block by number mask.
• 🤖 Should I Answer?: community of users, which evaluates the reliability of callers.

When installing such apps, be careful about the requested permissions. To work correctly, they need access to contacts, call log and phone. Trust only trusted, highly rated developers.

⚠️ Attention: Some free versions of applications may display advertising or transmit impersonal call statistics to their servers. Read the privacy policy carefully before installation.

Management of the blocked list and unblocking

There are situations in life when you need to return a contact to the white list. Perhaps you blocked the number by mistake or the conflict with the subscriber has been resolved. Removing from black list is as simple as adding.

Go to the application settings Phone and select Blocked numbers. You will see a complete list of all restricted contacts. To delete a number, click on the cross next to it or hold the entry and select “Unblock”.

Settings → Phone → Blocked numbers → [Select number] → Delete

After unblocking, the subscriber will again be able to call you and send an SMS. The history of past calls (if they were blocked and were not included in the log) will not be restored, but new calls will proceed in the standard way.

Check this list regularly so as not to miss important messages from delivery services or government agencies that could accidentally be filtered due to a change in their numbers.

What does the blocked subscriber see?

Usually a person hears one beep, and then the call is dropped or a voice message indicating that the subscriber is busy. SMS messages can be delivered to the server, but not displayed to the recipient.

Will the person see that I have added him to the black list?

The subscriber will not receive a direct notification about the blocking. However, indirect signs, such as constant short beeps when calling and the lack of SMS delivery, may lead him to this idea.

Is it possible to block a hidden number?

It is impossible to block a specific hidden number, since it is not identified. However, you can turn on the "Block unknown numbers" option in Android settings, which will reject any call without identifying the number.

Are voice messages from blocked contacts saved?

In the stock Phone app, voice messages from blocked numbers are usually not saved or sent to your phone. The caller immediately gets an answering machine or hears a reset.

Does blocking affect the operation of instant messengers (WhatsApp, Telegram)?

No, blocking a number in the Android phone book does not affect instant messengers. To block a user there, you need to use the internal settings of the WhatsApp or Telegram application itself.

How many numbers can you add to the blacklist?

The built-in Android tools usually do not have a hard limit, but can begin to slow down with a list of several thousand numbers. Third-party applications and operator services often limit the list to 100–300 numbers in free versions.