What does HD mean?

HD is the abbreviation of HD, and the "HD" displayed in the notification bar of mobile phone is only a part of "HD voice".

High-definition voice, or VoLTE, is an audio and video call technology based on LTE network. Compared with the traditional voice call under 2G and 3G networks, this technology has the characteristics of low delay, high quality and uninterrupted call.

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Disadvantages of HD call

Although HD calls have the advantages of low delay, high quality and uninterrupted calls, there are still the following shortcomings in practical use:

1, high power consumption

Because the HD call is based on 4G network, when using this function to make a call, the generated audio and video data stream will be transmitted through LTE data, so the power consumption is slightly higher than that of 2G and 3G networks.

2. One party can't make HD calls.

When one of the outgoing and incoming phones does not turn on this function, the VoLTE function will be invalid, so it cannot be used unilaterally.

You can't talk normally when the 3.4G signal is weak.

When the calling party is located at the edge of the 4G network or at the dead corner of the signal, the calling tone will be stuck and silent.