How to make sure that no one gets through, but the Internet works on Android

Constant calls from spammers or intrusive interlocutors interrupt work, even when it is critical to keep the mobile data active on Android for downloading files or messengers. The standard Do Not Disturb mode is often not effective enough, since by default it skips repeated calls or contacts from favorites, which does not guarantee complete silence. Users require a solution that tightly blocks all incoming voice traffic while maintaining a stable connection to the data network without the need to remove the SIM card.

The operating system Android there are several levels of voice blocking that do not affect packet data transmission. We will look at methods from customizing built-in functions to deep editing of access points APN. It is important to understand the difference between software call blocking and physically disabling the voice radio module.

Completing the steps described below will allow you to turn your smartphone into a full-fledged tablet with a SIM card. You will be able to use instant messengers, the browser and streaming services, while to the caller your number will appear as unavailable or busy. Let's look at the most effective ways to implement this task.

Using flight mode with manual data transmission

The fastest and most universal way to turn off voice communication is to activate the “Airplane” mode. By default, this mode enables all radio modules, including Wi-Fi and Bluetooth, but in modern versions Android they can be turned back on manually.

After activating airplane mode, the voice module stops registering with the cellular operator's network, making you completely unavailable for calls. However, if you turn on mobile data or Wi-Fi immediately after this, the Internet will continue to work stably. This is because data and voice protocols use different logical channels, even if they physically go through the same tower.

This method is ideal for temporary use when you need to quickly get away from communication. However, it has one significant drawback: you will not be able to receive SMS messagesas they are also transmitted over voice network signaling channels. If confirmation codes from banks are critically important to you, this method may not be suitable.

To activate, simply swipe the notification shade down and click on the airplane icon. Then, without turning off this mode, click on the “Mobile Data” or “Internet” icon. In some firmware, for example from Xiaomi or Samsung, you may need to go into the network settings to force 4G/LTE to be turned on.

⚠️ Attention: When using airplane mode, emergency calls (to numbers 112, 911) may also be blocked depending on the firmware version and regional settings your device. Make sure you have an alternative method of communication in critical situations.

Setting up unconditional forwarding to a non-existent number

A more elegant method that allows you to remain on the GSM network to receive SMS, but redirect all voice calls to “nowhere”. The essence of the method is to use the service unconditional forwarding. You instruct the system to forward all incoming calls to a number that obviously does not exist or is turned off.

To configure, you do not need to go into deep menus. Just open the “Phone” application (dialer) and enter a special USSD command. The universal command for activating forwarding of all voice calls is as follows:

**21*0000000000#

After entering this command and pressing the call button, you should receive a notification that the service has been successfully activated. Now everyone who tries to call you will hear a busy signal or a connection error message, while your phone remains silent. At the same time, the Internet operates as normal, since forwarding concerns only voice traffic.

To cancel this action and return the ability to receive calls, you must enter the cancel command:

##21#

This method is good because it works at the operator network level. Even if your phone is turned off or is in an area without coverage, but with Wi-Fi turned on, calls will still not go through to you, but the Internet via Wi-Fi will work. However, if you are using mobile data, the phone must be turned on and registered in the network for the redirection command to be processed correctly.

What will the caller hear?

Depending on the telecom operator, the subscriber may hear short beeps, the message “the subscriber is temporarily unavailable” or “the number does not exist.” This depends on how the operator handles forwarding to a non-existent number.

Editing APN access points to disable voice

This is the most technically complex, but also the most reliable method for advanced users. It allows you to programmatically “trick” your phone into using the SIM card only for data transfer, ignoring voice protocols. The method is to change the parameters access points (APN).

Go to the smartphone settings along the way Settings → Connections → Mobile networks → Access points (APN). Select your active access point (usually marked with a green dot). You need to find a field called APN type or APN Type.

By default, the value is indicated there default,supl,mms or similar. We need to change this value to exclude voice services. In some cases, adding the parameter dun (Dial-Up Networking) helps, but to completely block voice on some firmware, you need to create a new access point with type only internet or default, while deleting the old ones.

A more radical method is to create a new APN with an arbitrary name, in field APN enter the address of your operator (for example, internet.mts.ru), and in the field APN Type indicate strictly default,supl. Then save the settings, select this point and reboot the device. As a result, the phone may lose registration in the voice network, but will retain access to the Internet.

APN Parameter	Standard value	Value for voice blocking	Influence
Name	MTS Internet	NoVoice Data	Descriptive
APN	internet.mts.ru	internet.mts.ru	Gateway Address
APN Type	default,supl,mms	default,supl	Disables MMS and voice
Protocol	IPv4/IPv6	IPv4	Stability

⚠️ Attention: Incorrectly changing APN settings can lead to a complete loss of Internet access. Before making changes, take a screenshot of the original settings or write them down so that you can return everything as it was.

Blocking all incoming calls through the system black list

If you If you don’t want to tinker with network settings, you can use the built-in blocking tools. Most modern shells Android (MIUI, OneUI, ColorOS) have powerful built-in call filters. The task is to block absolutely all numbers.

Go to the “Phone” application, click on the three dots in the corner and select “Settings” → “Blocking numbers”. There is usually an option to “Block all incoming calls” or “Block unknown numbers”. Activating the first option will solve your problem. The phone will drop any incoming call automatically.

However, this method has a caveat: some operators or types of calls (for example, from emergency services or operator extensions) may pass through the filter. In addition, in some regions, blocking all numbers may be a paid service provided by the operator, and not a phone feature.

For owners of “clean” Android (Pixel, Motorola), this function may be hidden. In this case, it is recommended to install a third-party call blocking application, for example Calls Blacklist. In the settings of such an application, you need to check the box next to “Block everything.”

Use of third-party applications and automation

For those who like flexibility, this is an excellent solution automation applications such as Tasker or MacroDroidwill become. With their help, you can create a script that will automatically reject any incoming call instantly, without allowing the phone to even start vibrating or ringing.

V MacroDroid This is done by creating a macro: Trigger “Incoming call” (any number) → Action “Reject call”. This script works quickly and efficiently. The advantage of this method is that you can set up exceptions if you suddenly need to accept a call from a specific person, simply by adding a condition to the macro.

There are also applications that simulate Do Not Disturb mode, but with more stringent settings. They allow you to set a schedule: for example, from 9:00 to 18:00 calls are completely blocked, and the Internet works. This is convenient for office workers who want to use their work phone only for the Internet at certain hours.

It is worth considering that aggressive blocking through third-party applications can consume additional battery power, since the application needs to constantly hang in the background and monitor the status of the phone. To save energy, it is better to use system methods or airplane mode.

⚠️ Attention: Automation applications require broad permissions to access the phone and call log. Download them only from the official store Google Play and check reviews to avoid malware.

Why is Tasker better than built-in tools?

Tasker allows you to create complex logic, for example: block calls if you are connected to Wi-Fi at home, but allow them if you are roaming. Built-in tools usually work on an “all or nothing” principle.

Comparison of methods and possible limitations

The choice of a specific method depends on your goals and phone model. If you just need to avoid distractions for a couple of hours, airplane mode is ideal. If you want to permanently get rid of calls on the second SIM card, which is used only for the Internet, editing APN or forwarding is better.

Do not forget about technical limitations. In 2G and 3G networks, voice and data can be transmitted over the same channel, so completely disabling the voice module may affect the Internet speed. In 4G (LTE) and 5G networks these streams are separated, so problems are unlikely.

Also, if you completely block calls for several months, the operator may consider the SIM card inactive and block it, which will lead to loss of access to the Internet.

Below is a table comparing the main methods according to the criteria of efficiency and complexity:

Method	Difficulty	SMS blocking	Internet operation	Reliability
Airplane mode	Low	Yes	Yes (manual on)	High
Forwarding	Medium	No	Yes	Medium
APN settings	High	No	Yes	High
Black list	Low	No	Yes	Medium

Can I accept calls through instant messengers when cellular communications are blocked?

Yes, absolutely. Blocking cellular voice communications (GSM/3G/4G Voice) does not in any way affect the operation of applications that use Internet Protocol (VoIP). You will be able to receive calls on WhatsApp, Telegram, Viber and Skype, as they use a data connection that remains active.

Will Google Assistant work?

Voice search and commands that do not require a call will work. However, the function of calling contacts by voice (“Call Mom”) will not work because the telephone module is locked. The assistant will report that it cannot make a call.

What to do if the Internet is lost after changing the APN?

Return to the access point settings (APN), press the menu (three dots) and select “Reset to default settings”. This will restore the original settings of your operator, and the Internet should work.

Can the operator determine that I use the SIM card only for the Internet?

The operator sees traffic statistics. If a SIM card carries a large amount of data, but there is no voice activity, this may look suspicious for some “unlimited Internet for smartphone” tariffs. In rare cases, the operator may transfer you to a tariff for modems or tablets. It is recommended to check the tariff conditions with your provider.

Does this method work on dual-SIM phones?

Yes, you can set up call blocking for only one SIM card (for example, the second), leaving the first one fully functional. In the forwarding or blacklist settings, select a specific SIM card to apply the rules.