Loudspeaker issues

My mother got a Fairphone 4 for her birthday but is experiencing strong issues with the loudspeaker mode when calling others. It seems to pick up noise around her and produces an unbearable experience to her, she’s discussed getting a refund. Since I’d be rather unhappy with that since she’d get a bad experience and would buy from less ethical manufacturers, I’d like to know if anybody has a workaround or something similar for that issue. She has already texted support, but its solution (turning off microphone permission for Google) doesn’t work and she hasn’t heard much else from support. Let me know if you have a solution.

TL;DR:
Microphone during call picks up bad audio, any way to fix?

5 posts were merged into an existing topic: Call quality and noise cancellation (regular calls, handsfree, Signal voice messages, Microsoft Teams video calls)