When we see the "HD" icon displayed on the signal bar of our phone, we may be a little confused and don't know what it represents. In fact, the "HD" icon indicates that the phone is using the HD voice call function, also known as Voice Over Long-Term Evolution (VOLTE) technology.
VoLTE is a high-definition voice call technology based on 4G network, which can achieve high-definition quality of voice calls and ** calls under 4G networks, which has significantly improved the call quality compared with traditional 2G and 3G networks. In VoLTE calls, the voice is clearer and more realistic, just like face-to-face conversation, and it also supports the **call function, making communication more vivid and intuitive.
In addition to the improved call quality, VoLTE technology has many other advantages. First of all, VoLTE calls are made over the 4G network, so they don't take up the call time of your phone, and you can enjoy free voice calls even when you don't have Wi-Fi. Secondly, the connection speed of VoLTE calls is very fast, and it usually only takes a few seconds to establish a call connection, which is much faster than the call connection speed under traditional 2G and 3G networks. In addition, VoLTE also supports multi-person calling, allowing multiple users to join the same call at the same time, which is convenient for group communication.
To use the VoLTE feature, you first need to make sure that your phone supports VoLTE technology and that the VoLTE switch is turned on. Different phone brands may have slightly different ways to turn it on, but you can generally find the "Mobile Network" or "Network Settings" option in the settings menu of your phone, and then find the "Volte" or "HD Voice Call" option in it, and turn it on. At the same time, you also need to make sure that the carrier in your region supports the Volte service, otherwise you will not be able to use it even if the phone supports Volte.
In general, the "HD" icon displayed on the mobile phone signal bar means that the mobile phone is using VoLTE technology for HD voice calls, which is a high-definition calling technology based on the 4G network and has many advantages, such as high call quality, fast connection speed, support for multi-person calls, etc. To use the VoLTE feature, you need to make sure that both the phone and carrier support VoLTE technology and turn it on. With the popularization of 4G network and the arrival of 5G network, VoLTE technology will become more and more popular and become one of the mainstream technologies of mobile phone communication in the future.