It seems that after using Whatapps with a bluetooth connection, the sound is not properly routed in subsequent calls when not using BT. The other side cannot hear me.
Have you tried restarting the phone?
This might be a work-around.
@Julie_Winnard Is your case the same (after using WA with Bluetooth) or just using the standard phone app?
Thanks for the workaround idea. I did not try it since it is actually not feasible. I would have to preemptively restart the phone every time I turn the Bluetooth off. I wasn’t certain if others were experiencing the same problem, but it seems to be the case. This issue is potentially a deal breaker for many users. I cannot afford not to be able to answer a WhatsApp call when using the phone.