The audio/video call doesn't work as expected. Thats true.. But for me, the reason for that could be my old Iphone. However, I extensively use the chat functio

The audio/video call doesn't work as expected. Thats true.. But for me, the reason for that could be my old Iphone. However, I extensively use the chat functionality on iphone/android/linux/osx and that works perfect. And I really appreciate that I can logged-in, with multiple devices at the same time.