Bluetooth headset the other party can't hear me on any internet calls

[khrahaf]

I have iPhone 4S, I bought new bluetooth headset, it is working fine on normal calls, but when using it on internet calls like WhatsApp calls or Messenger calls etc… the other party can’t hear me but I hear him very well, and the Audio button is flickering between (Audio symbol with 3 brackets) and (Audio symbol with bluetooth logo) I have attached gif image showing the flickering.



By the way, I bought another one, it worked for the first time but after charging it it makes the same problem.

 

[Just_Me_D]

Is there a settings/option feature within the apps you mentioned in which you can select the Bluetooth headset?

 

[khrahaf]

Hi,
In WhatsApp there is no feature, also I tried in iPhone settings to allow WhatsApp Audio, but no luck, I can hear the caller but he can't hear me.

The strange thing is that we can hear each other very well on normal call