The first picture is online and you choose a beauty to trick you into it.
Although 4G networks have been popular for two to three years, many people use 4G networks with only data services (Internet access) and have not opened VoLTE functions (4G HD calls). 4G networks have not been fully utilized. This is true of many friends around me. The conditions for opening VoLTE have not yet been opened for use. First, because there are only a few mobile phone terminals and networks in the early stage, and secondly because operators and mobile phone manufacturers are not propagating enough in VoLTE, many users do not care. So the question is, what is VoLTE? What are the benefits of VoLTE? Does my phone support VoLTE? How to open? The following answers for everyone.
What is VoLTE?
Duangniang had the answer.
VoLTE is Voice over LTE. It is an IP data transmission technology. It does not need 2G/3G networks. All services are carried on 4G networks, and data and voice services can be unified on the same network. In other words, 4G networks not only provide high-speed data services, but also provide high-quality audio and video calls. The latter requires VoLTE technology. The most direct experience that VoLTE technology brings to 4G users is shorter turn-on latency and higher quality, more natural voice and video calls. VoLTE is essentially different from 2G and 3G voice calls. VoLTE is an end-to-end voice solution based on all-IP conditions over a 4G network. Compared with 2G and 3G voice calls, VoLTE can improve voice quality by about 40% because it uses high-resolution codec technology. VoLTE brings users lower access latency (waiting time after dialing), which is 50% lower than 3G, which is about 2 seconds, compared with 6-7 seconds in 2G era. In addition, the dropping rate of 2G and 3G occurs from time to time, but the dropping rate of VoLTE is close to zero.
The detailed explanation will not be expanded. Interested friends can search on the Internet. As long as the average user knows the benefits of VoLTE and how to open it.
What are the benefits of VoLTE?
The following shows you with a simple and easy test
1, call faster dial-up speed
In the case of a good signal, after the 2G call is dialed, it usually takes more than 6 seconds to hear a beep tone. The VoLTE call can reduce this waiting time to 2-3 seconds. This is also the first difference after the opening of VoLTE.
Take a look at the actual test situation below. Prepare two mobile phones that have VoLTE enabled, use one to call the other, and dial the stopwatch to record the dial-up waiting time.
Test one: First turn off the VoLTE function of both phones
Results: After counting the delay of the mobile phone itself, ordinary calls will take nearly 9 seconds to dial.
Test two: Turn on the VoLTE function of one of the mobile phones
Result: The same is about 9 seconds
Test 3: Turn on the VoLTE functions of both mobile phones
Result: After counting the delay of the mobile phone itself, it takes only about 6 seconds to dial the VoLTE call.
Conclusion: VoLTE calls are faster than regular calls and only mobile phones are available for both parties.
2. You can access the Internet while you are on the phone, and you don't need to worry about the phone coming in to drop the game card.
This does not need to explain, or the last move to see it
3. The most important point: The sound quality of VoLTE calls has been greatly improved compared to ordinary calls.
This section is the focus of this article, the quality of this thing is too metaphysical, insensitive people do not remind you may not feel, but in fact the improvement of sound quality is the place of greatest impact on daily use. First, we listened to a few paragraphs of recording. We recommend that you bring your headphones.
Test method: When two mobile phones are talking, use a signal cable to connect one of the phone's earphone jacks to the sound card, and use the recording software to record the contents of the other phone's speech.
The signal flow is as follows:
Record one: First turn on the VoLTE function of both phones.
Is this sound quality normal? VoLTE call at this level? Don't hurry to conclude that the sound quality is completely contrasted and continue to listen to the recording below.Recording 2: Turn on the VoLTE function of one of the phones and the other one is off.
Did you hear a lot of noise? This is caused by the cell phone signal interference recording equipment, but with the same test method and equipment, the VoLTE function of both mobile phones is turned on.Recording three: In order to avoid the interference impact test, I put the phone farther away from the sound card. Still turning one of the phone's VoLTE features on and the other off.
Recording 4: Turn off the VoLTE function of both phones
Through the above four-segment recording, it can be concluded that the VoLTE call has a much higher sound quality than an ordinary call. It is no longer the kind of "phone tone". It is like pulling the phone from the phone to the front of the phone. The premise is that both sides of the phone support the call. And the VoLTE call is much less disruptive to the device than the ordinary call. So is the radiation to people lessened? This is not the focus of this article. Let's dig it yourself.
Some people may say this time, I can not hear the difference between the fun ah ~ Well, simply listening to my own recording may not be particularly obvious, I also used the above method recorded two pieces of music released with a speaker. (The function of the mobile phone shielding background noise will affect the recording quality of the music)
Recording V: VoLTE functions of both mobile phones are turned on after the recording of music
This is the spectrum diagram of the VoLTE call recording file. The high frequency limit is about 8000Hz.
This is a spectrum diagram of an ordinary call recording file. The high frequency limit is about 4000 Hz.
If you count harmonics, the vocal frequencies of most people are in the range of 100-8000 Hz. VoLTE calls can just cover this range, while ordinary calls are much worse, filtering out high frequencies above 4000 Hz.
4000-8000Hz is the area where the lip-tooth sound is located. This band lacks clarity that can affect the consonants in the voice. This is why the VoLTE call is much clearer than the normal call.
Does my phone support VoLTE?
VoLTE requires the support of mobile phone hardware. Basically, high-end mobile phones that are listed after 2016 are supported, and some low-end mobile phones are also supported. For details, you can check whether there is a VoLTE function option in your phone's call settings, or consult your mobile phone manufacturer and distributor.
How to open VoLTE?
After confirming that your mobile phone supports VoLTE, you can apply to the operator to open a VoLTE service.
Mobile users send ktvolte to 10086 and reply “yes†according to the SMS prompt to open.
Unicom seems to be the default to open VoLTE business, as long as your phone supports it. Unicom users can call 10010 to consult with local operators.
Telecommunications seems to have just begun commercial trials, and there is no VoLTE service in most regions. I asked the telecommunications customer service, I feel like I’m still
It should be noted that after the VoLTE service is enabled and the VoLTE function switch is enabled on the mobile phone, the VoLTE service can take effect after the mobile phone is restarted. The Android mobile phone has an HD identifier, and the Apple mobile phone has no indication.
There is also the domestic can not currently achieve cross-operator VoLTE calls, so that the cooperation of the three major operators there is a certain degree of difficulty.
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