And even today, there are more and more State-of-the-art technology. Make the call and talk at the past only hear sound. At present, we can talk to each other face-to-face, or so-called video.
And the current is more modern technology. Make a call, talk In the past could only hear. At present, we can talk face to face. Also known as a video call.
And the more current with modern technology. The call to talk about that in the past can only hear the sound. At present we can talk face to face, also known as the video collection