What does it mean when VoLTE appears on a mobile phone?

Some netizens may find a "VoLTE" icon or "HD" icon on their mobile phones. What does this mean? In fact, whether "HD" or "VoLTE" is displayed, it means that you have enabled the function of voice calls through 4G traffic. VoLTE is the abbreviation of Voice over LTE. VoLTE is essentially a voice service based on IMS. Compared with 2G/3G voice, VoLTE voice is clearer and more reliable, and supports IP video calls, as well as Internet + voice services.

How is the principle of VoLTE technology different from 2G/3G?

In terms of VoLTE technology, VoLTE is a voice service based on IMS, which means making voice or video calls through 4G traffic. It is an IP data transmission technology that does not require 2G/3G networks. All services are carried on the 4G network, which can achieve the unification of data and voice services on the same network. The 4G network not only provides high-speed data services, but also provides high-quality audio and video calls, which require VoLTE technology to achieve.

The principle of 2G voice is to convert the sound signal into digital signal encoding for transmission, and after reaching the other party, it is demodulated and restored to the sound signal. Compared with 2G voice, 3G voice technology has stronger transmission capacity and can realize network data transmission, but the phone still uses digital communication. Subsequently, Internet phone, also known as VoIP, appeared, but the effect of Internet call is not ideal.

What are the advantages of VoLTE compared to 2G/3G?

First, VoLTE technology has the characteristics of fast connection and no dropped calls. VoLTE brings users lower access delay (waiting time after dialing), which is 50% lower than 3G, about 2 seconds, while 2G era is 6-7 seconds. And the dropped call rate of VoLTE is close to zero.

At the same time, VoLTE has higher call quality. VoLTE is built on the 4G network and is a voice call technology that matches LTE Internet access in the 4G era. Therefore, compared with 2G and 3G voice calls, the voice quality can be improved by about 40%. Compared with the past 2G voice calls, the voice under VoLTE is fuller, has a unique sense of space and layering, and restores the real voices of both parties to the greatest extent. At the same time, it can also provide high-speed video calls and multimedia services.

It is worth noting that although VoLTE also uses data, it does not affect the normal Internet access of the mobile phone. You can play games and watch TV shows at the same time without interfering with each other. VoLTE is two-way, and both phones must support VoLTE for a two-way call, otherwise you will not be able to enjoy VoLTE high-definition calls.

How to turn it off or on?

Some Android phone users can see the "VoLTE" logo in the "Mobile Network" option in the phone settings. To the right of the logo is an on or off button. Click it to turn it off or on.

For Apple phones, in the "Cellular Data Options" option, you will see "Enable 4G". After clicking it, two options will appear - "Off" and "Voice Only". If you don't want to make calls over 4G, just choose to turn it off.