Very bad mic quality during VoIP calls

I tested Skype and Viber but the app doesn't matter. My conversationalist hear me very, very bad: there are crackle, sometimes he nothing hear or hear very quiet. Simply he he can understand every other my word.
I've got very good conection quality from Wi-Fi, conversationalist also. He talks with other people on Skype and he doesn't have any problems with them.
Lenovo A7-50 A3500-H

Do you have a case on your phone?   Try removing it and see if call quality improves.

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