If you notice a new icon in the upper right corner of your smartphone screen with the inscription VoLTE, do not panic - this is not a virus or a sign of a breakdown. On the contrary, the appearance of this indicator indicates that your device is connected to a modern fourth generation network and is ready for high-quality voice communications. Voice over LTE technology is gradually replacing older standards, providing crystal clear sound and instant connection without delays.
Many users confuse this icon with the mobile data or Bluetooth indicator, but its functionality is strictly specific. It lights up only when the telecom operator and your Android smartphone support voice transmission over 4G networks. This allows you to talk on the phone and use fast Internet at the same time, which was impossible in the era of 2G and 3G networks.
In this article we will look in detail at why this function is needed, how it affects the quality of communication and what to do if the icon is on, but calls do not go through. We will look at the settings on popular phone models and answer the most common questions that gadget owners have when faced with this technology.
What is hidden behind the abbreviation VoLTE
Abbreviation VoLTE stands for Voice over LTE, which literally means “Voice over LTE”. Traditionally, fourth-generation networks (LTE) were developed exclusively for the transmission of packet data, that is, for the Internet. Voice calls on such networks were not initially supported, and the phone had to switch to older standards (3G or 2G) to make a call, which caused noticeable delays.
With the introduction of VoLTE technology, voice began to be transmitted as a regular data stream, similar to what instant messengers do, but with the priority of the telecom operator. This means that your device no longer has to “switch gears” when you receive or receive a call. The signal remains in the 4G zone, which ensures a stable connection even when the network is congested.
The key advantage is not only the connection speed, but also the sound quality. The voice is transmitted in high definition format (HD Voice), which makes the interlocutor’s speech more natural and intelligible. If you often communicate in noisy places or are at the edge of a coverage area, the difference will be especially noticeable compared to standard calls.
⚠️ Attention: The presence of the VoLTE badge does not guarantee free calls. Traffic is consumed according to your tariff plan, but usually voice minutes are charged as regular calls, and not as Internet traffic.
The main advantages of the technology for the user
The transition to a new communication technology gives subscribers several tangible advantages that improve everyday life using a smartphone. First of all, this concerns the speed of connection establishment. In networks of the old format, waiting for beeps could take from 5 to 10 seconds, while VoLTE reduces this time to 1-2 seconds, making the call process almost instantaneous.
The second important advantage is the ability to simultaneously use voice and data. Previously, during a conversation, the Internet connection would often drop to EDGE (E) or 3G (H), making it impossible to navigate or send heavy files. Now you can conduct a video conference, play online games or watch high-definition videos without interrupting the conversation.
In addition, the technology helps save battery power. Since the phone does not have to constantly switch between 4G and 3G/2G modes during a call, radio power consumption is reduced. This is especially noticeable during long conversations or in areas where the 4G signal is unstable, but still present.
- 📶 Instant connection with the subscriber without long waits for beeps.
- 🎧 High sound quality (HD Voice) with suppression of background noise.
- 🌐 Simultaneous operation of fast 4G Internet and voice calls.
- 🔋 Reduced power consumption of the radio module due to the absence of frequent network switching.
If you are often in places with a poor signal, turning on VoLTE can significantly improve speech intelligibility, since the digital LTE signal breaks through better than analog 2G.
How to activate the function on different smartphone models
The activation of the function may vary depending on the manufacturer of your device and the version of the operating system Android. Most often, the setting is located in the mobile networks menu. If your operator supports the technology and it is activated on the SIM card, all you have to do is switch the corresponding toggle switch in the phone settings.
On Samsung devices, the path usually looks like this: go to Settings, select Connections, then Mobile networks. There you need to find the item “Calls via LTE” or “VoLTE” and activate it. On some models, this item may be hidden if the SIM card is not recognized as supporting the standard.
For Xiaomi, Redmi and POCO smartphones, the algorithm is slightly different. Go to Settings, select SIM cards and mobile networks. Select the desired SIM card and find the “Use VoLTE” switch. On devices with pure Android (Pixel, Motorola), the settings are located at Network and Internet → Mobile network → Advanced.
☑️ Checklist for activating VoLTE
It is important to note that on some models, especially Chinese versions of global brands, the menu may be hidden in engineering mode. However, for most users the standard settings are sufficient. If you do not find the switch, your operator may have already enabled this feature by default, and the icon VoLTE will appear automatically when there is coverage.
Why the icon may not appear or disappear
The situation when the icon is not lit constantly or does not appear at all is one of the most common problems. Most often, the reason lies in the lack of LTE network coverage in a particular location. If you are in a basement, elevator, or remote area, the phone may switch to 3G and the VoLTE indicator disappears.
Another common cause is the type of SIM card installed. Old mini-SIM cards or early versions of micro-SIM may not support the security standards required for voice calling over LTE. In this case, you need to replace the SIM card with a new USIM at the service provider.
It is also worth checking whether the power saving mode is turned on on the phone. Some battery optimizers can forcefully disable 4G features to save power, which causes the icon to disappear. In addition, the function may be disabled on the operator's side, even if the phone supports it.
| Reason for absence | Symptom | Solution |
|---|---|---|
| No 4G coverage | The icon disappears in certain areas | Go to an open place or change location |
| Old SIM card | The icon does not appear anywhere | Replace the SIM card in the cabin operator |
| The function is disabled in the menu | There is 4G, but there is no VoLTE sign | Enable the switch in the network settings |
| The phone does not support | No item in settings | Check the model specifications on the manufacturer's website |
⚠️ Attention: Settings interfaces and item names may change after updating the firmware. If you do not find the described item, use the search in the settings by entering the query "VoLTE" or "Mobile networks".
The influence of technology on the quality of communication and the Internet
Implementation VoLTE dramatically changes the user experience mobile communications. Users often note that the interlocutor can be heard better, the characteristic distortions and “robotic” voice characteristic of compression in old networks have disappeared. This is achieved through the use of high-quality codecs that transmit a wider frequency range of sound.
As for the Internet, the technology allows you to not interrupt the loading of content during a call. This is critically important for those who use navigators (for example, Yandex.Navigator or Google Maps) during a call. Without VoLTE, the navigator could “freeze” or lose the route during a conversation, since the data channel switches to low-speed mode.
However, it is worth considering that the quality of communication directly depends on the load on the base station. If the 4G network is overloaded with a large number of users in a particular location, priority may be given to Internet traffic, and the quality of the voice call may temporarily decrease, although it will remain better than in 3G.
Technical details of the codecs
VoLTE technology usually uses the AMR-WB (Adaptive Multi-Rate Wideband) codec, which provides a frequency band from 50 Hz to 7000 Hz. For comparison, regular telephony uses narrowband audio up to 3400 Hz, which cuts off high frequencies and makes the voice less natural.
Compatibility of operators and tariff plans
In Russia and the CIS countries, all major operators (the Big Four) have long supported Voice over LTE technology. However, for it to work, the service must be active on your number. On some tariffs, especially archived ones, the function may be disabled by default.
To activate, it is often enough to send a USSD command or use the operator’s personal account. For example, for some providers you need to enter a command in the format *155*00# (the code may differ, check with your operator). After this, the phone will receive an updated network profile and the icon should appear.
It is important to understand that roaming using VoLTE does not work in all countries. When abroad, the phone can automatically switch to standard 2G/3G networks for voice calls even if the 4G icon is lit. In such cases, the icon VoLTE may disappear or be replaced by a RoLTE (roaming VoLTE) indicator if operators have an appropriate agreement.
- 📱 Check the service status in your operator's application.
- 💳 Make sure there are funds in the account and the tariff is not blocked.
- 🌍 When traveling abroad, check the VoLTE roaming conditions.
- 🔄 After changing the operator or tariff, you may need to re-configure.
The main idea of the section: Operator support for technology is only half the success; the second half is the correct configuration of the SIM card and the subscriber’s device itself.
Is it safe to use VoLTE? Will the extra money be written off?
Using the technology is completely safe. Calls via LTE are charged exactly the same as regular voice calls, according to your tariff plan. Internet traffic is not consumed in this case, since the voice stream has priority and goes through a separate channel. Operators do not charge additional fees for the very fact of using the technology.
Is it possible to call via VoLTE if the mobile data is disabled?
Yes, you can. Voice calls over LTE do not require packet Internet (data transfer) to work. It is enough that the preferred network type 4G/LTE is selected in the network settings. VoLTE technology itself uses control channels that work regardless of your Internet traffic tariff.
Why is the VoLTE icon lit, but calls are not going through?
This may indicate problems on the base station side or a temporary failure in registering the device in the IMS (multimedia kernel subsystem) network. Try turning airplane mode on and off to re-register online. If the problem persists, you may need to update your phone software.
Does VoLTE work on two SIM cards at the same time?
Most modern smartphones support Dual SIM Dual Standby mode with VoLTE on both SIM cards. However, during a conversation on one SIM card, the second one may temporarily go into standby mode or 2G/3G, depending on the implementation of the radio module in your specific device.