Please help! How can i increase the speaker volume when i video call on my S G6?

[AC Question]

Both hubby and I have S G6. He says he can hear us loud and clear, but kids and I can barely hear him. Have tried everything I can think of

 

[josiahlikesminecraft]

Maybe he has a faulty mic.

Posted via Lg g3 Running Cyanidel Android 5.1.1