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Skype is the most widely used video chat software in the world and can be installed free; therefore the best tool for students and teachers for the class. In mobile LTE and above-level device, sound quality and video will be fine. There will be no cost within Skype communication; however data usage will do. From mobile device, it would be better to use WiFi to minimize data charge. Depends on the speed of net or WiFi, sound quality and video quality may be affected. If Skype is not in your computer, download and install from our website.
If you prefer other software like Zoom or WeChat other than Skype, you can also use it in consultation with your teacher.