The situation when a user needs to completely isolate himself from voice communication, but at the same time maintain access to the global network, occurs quite often. This may be necessary during important work, vacation, or during periods when the tariff plan does not include free minutes and the Internet is unlimited. Standard blocking methods often disable all cellular communications, depriving you of the ability to use instant messengers or mail.
In the operating system Android there are several mechanisms for managing network modules that allow you to flexibly configure access. However, there is usually no single “Stop calls” button in the interface, since the developers assume that the phone should remain a means of communication. However, using a combination of system settings, Do Not Disturb modes and special operator codes, you can achieve the desired result.
In this article we will look at all the available methods: from simple profile settings to advanced manipulations with network protocols. You will learn how to set up your device so that it works as a full-fledged tablet with a SIM card, receiving data but ignoring voice calls.
Using Do Not Disturb mode with call filtering
The easiest and safest way to isolate yourself from calls without losing your Internet connection is to use the built-in mode "Do not disturb". In modern versions Android this tool has expanded filtering capabilities. By activating it, you can allow data to flow through a mobile network or Wi-Fi, but mute sound signals and vibration for an incoming call.
To configure this mode correctly, you need to go to the sound settings section. Here you will find exclusion options. By default, the system may allow calls from favorite contacts or repeat calls. You'll need to change these settings to "Nobody" or "Contacts Only" if you want to block all strangers. It is important to understand that in this mode the phone still receives a call, but does not make sounds, and the subscriber hears beeps or gets an answering machine.
For maximum silence, it is also recommended to turn off vibration in the mode settings. This will allow you to work or relax without being distracted by the physical signals of the device. At the same time, background applications, such as Telegram, WhatsApp or the browser, will continue to receive data packets as normal.
To quickly enable this mode, add the Do Not Disturb tile to the notification shade and set it to long-press to access detailed filtering options.
It is worth noting that this method is software-based blocking notifications, rather than physically cutting off the voice communication channel. From the point of view of the telecom operator, your phone is online and ready to receive a call, the user has simply decided not to hear it.
Setting up forwarding of all voice calls
A more radical method that actually redirects the incoming call to another number or to voicemail without breaking the Internet connection. This function is controlled at the level of the operator's network and phone settings. You can set up unconditional forwarding, which will work for any incoming call.
To implement this method, you will need a number to which calls will be sent. This could be a friend's number, a second SIM card, or a special voicemail service from your operator. If you enter a number that doesn't exist, the caller will simply hear a "number does not exist" tone, effectively discouraging them from trying again.
Setup is done through the phone menu or using USSD codes. In the menu you need to find the “Calls” section and select “Forwarding”. Here, select the “Always forward” option and enter the desired number. After activation, all voice calls will go past your device, and the mobile data will continue to work stably.
Codes for manually setting up forwarding
**21*phone_number# - activation of unconditional forwarding. ##21# — disable forwarding. These codes work for most operators, but may differ depending on the region.
⚠️ Attention: The forwarding service may be paid according to your tariff plan. Before activating, check the cost per minute of the forwarded call with your telecom operator to avoid unexpected charges.
The advantage of this method is that the call does not arrive on your device at all, saving battery power and not creating even minimal background noise. You are completely invisible to the voice network, remaining online in the data network.
Manually switching the network type to packet-only mode
The most technically sound way to separate voice from the Internet is to force the phone to switch to packet-only data mode. Voice communications on 2G and 3G networks often use Circuit Switched channels, while the Internet uses Packet Switched. In 4G networks (LTE), voice is transmitted through technology VoLTE, which is also packet technology.
If you disable support for voice standards in the modem settings, the phone will not physically be able to receive a call, but will be able to register on the network for data transmission. To do this, you need to go to the mobile network settings menu. The path usually looks like this: Settings → Connections → Mobile networks → Network mode.
You need to select a mode that excludes voice standards, if available in your firmware. However, most consumer smartphones do not explicitly have this option. In this case, you can try disabling the function VoLTE and select the “LTE Only” mode (if available). In some cases, when the phone is in an area with only 4G coverage, and VoLTE is disabled or not supported by the operator, the incoming call will simply not go through, since the phone will not be able to switch to 3G for voice communication, but the Internet over 4G will continue to work.
| Network type | Voice support | Support Internet | Risk of missed calls |
|---|---|---|---|
| 2G / 3G | Yes (GSM/UMTS) | Yes (slow) | Low |
| 4G LTE (with VoLTE) | Yes (via the Internet) | Yes | Low |
| 4G LTE (without VoLTE) | No (requires a drop in 3G) | Yes | High (the call will be dropped) |
| 5G | Yes (VoNR) | Yes | Low |
The method of operating only in LTE mode without support for voice standards is the most effective for physically blocking calls, but requires verification of support by your operator.
Experimentally, you can achieve a situation where the phone “sees” the tower for the Internet, but ignores paging signals for voice calls. This requires fine tuning and knowledge of the network features of your region.
Use of blocking applications and blacklists
If the system settings seem too complex or insufficient, specialized applications from the store come to the rescue. Google Play. There are many utilities, such as Calls Blacklist, Truecaller or built-in solutions from shell manufacturers (for example, MIUI or OneUI), that allow you to create blocking rules.
You can configure the application to automatically hang up any incoming call. Some advanced blockers have a “Quiet Hour” or “Focus Mode” mode, which is activated according to a schedule or manually. In this mode, all calls are rejected instantly, often without even a dial tone from the caller.
- 📱 Automatic reset: The application instantly hangs up, preventing the phone from vibrating.
- 📅 Schedule: Ability to set blocking only for working hours or weekends.
- 👥 White list: Option to allow calls only from specific contacts (for example, from family or courier), blocking all others.
It is important to grant such applications the necessary permissions. In modern versions Android you need to give rights to manage calls and access the phone. Without this, the security system will not allow the application to intercept an incoming call.
Using third-party software gives flexibility, but you should remember about resource consumption. Background operation of the blocker may slightly increase battery consumption, although on modern devices this is almost unnoticeable.
Engineering menu and hidden Android settings
For advanced users, there is access to the engineering menu, where you can control the parameters of the radio module at a deeper level. This menu is entered through a set of special codes in the “Phone” application, for example ##4636##. However, the set of codes may differ depending on the device manufacturer (Samsung, Xiaomi, Pixel).
In the “Phone Information” menu that opens, you can find the settings for your preferred network type. Options to disable specific radio interfaces are sometimes available here. For example, you can try disabling only voice Bearers, leaving the PS (Packet Switched) domain active. This requires caution, since incorrect settings can lead to a complete loss of communication.
Path in the engineering menu:1. Dial the code in the dialer.
2. Select “Phone Information.”
3. Find the “Preferred network type” drop-down list.
4. Try choosing a mode that excludes voice (if available).
⚠️ Attention: Changing settings in the engineering menu may lead to unstable network operation or the inability to make emergency calls. Use these settings only if you understand the consequences of your actions.
On some devices with superuser rights (Root), you can use applications like Radio Control to completely disable the CSC (Circuit Switched Core) voice module, leaving only the PSC (Packet Switched Core) active. This is an ideal solution to the problem, but it requires unlocking the bootloader and obtaining root access, which voids the warranty.
☑️ Preparing to work with the engineering menu
Features of working in 4G and 5G networks
With the transition to modern communication standards, the line between voice and the Internet erased. In networks LTE i 5G voice is transmitted as a data stream (VoLTE, VoNR). This means that the classic separation of “voice separately, Internet separately” becomes technically difficult to implement without operator participation.
If your operator supports VoLTE, then turning off the Internet will actually disable the ability to receive calls in high quality, switching the phone to 3G. Conversely, if you want to keep the Internet, but remove the voice, you need the phone not to support the IMS (IP Multimedia Subsystem) protocol, which is responsible for voice in LTE.
In some cases, forcing the “4G Only” mode when the VoLTE function is disabled in the operator settings helps. The phone will maintain a connection to the data tower, but when you try to make an incoming call, the network will not be able to find a voice channel because the phone will refuse to switch to 3G and VoLTE is turned off. As a result, the call simply will not reach the subscriber.
It is worth considering that network settings are dynamic. Telecom operators regularly update equipment and change broadcast parameters. What worked yesterday may change tomorrow after updating the network profile on the SIM card.
⚠️ Attention: 4G/5G network settings and available features may vary by carrier and region. Tariff details and technical capabilities may change, so check the latest information in your operator's personal account.
Frequently asked questions (FAQ)
Will WhatsApp work if I turn off incoming calls?
Yes, instant messengers use the Internet channel (batch transmission data). Blocking cellular voice calls (GSM/UMTS/LTE Voice) does not affect the operation of applications that use the IP protocol, such as WhatsApp, Telegram or Viber. You will be able to receive calls through these apps unless you block them separately.
Will the caller see that I have muted calls?
It depends on the method. In Do Not Disturb mode, the caller hears normal ringtones. When forwarding, it will be forwarded to another number or answering machine. When a call is dropped through the app or there is no network for voice, he may hear short beeps and a reset, or a message about no answer.
Is it possible to turn off calls only from specific numbers, leaving the Internet?
Of course. To do this, it is best to use the built-in blacklist or blocking applications. You can add specific numbers to the list of prohibited numbers, and they will not be able to reach you, while other phone functions and the Internet will work normally.
Does blocking calls affect the speed of the mobile data?
No, blocking voice calls does not affect the data bandwidth. The speed of the Internet depends on the quality of the signal, the load on the tower and your tariff plan, but not on whether you receive voice calls or not.
What to do if after the settings the Internet also disappeared?
If you used the engineering menu or changed the network type, you may have turned off the entire radio module. Try turning airplane mode on and off. If this does not help, go to the mobile network settings and select the “Auto (4G/3G/2G)” mode or reset the network settings in the main phone settings menu.