Microphone issue S21 ultra

[Motty2012]

Hi all.. Other people I talk to are saying my voice is muffled and quiet . The problem only occurs when I talk when the phone is to my ear. Speakerphone is fine and people can hear me no issues . It's just been a problem for the last few days. If I leave myself a voicemail to test, it sounds terrible. Any ideas please? 

[tnarmyng]

I can't access that test with the dialpad code you suggested 

[Members_x5uSiYG]

Same problem here, the issue started in summer 2022.

I got my lower microphone replaced in warranty by the Samsung service and nothing has changed. I tried different sim providers hoping it was the line.
The issue does not happen with earphones or by swapping the sim on another phone. It is less obvious during online calls (whatsapp etc) where the dual microphone get used. Also sometimes the audio goes up/down.

On 100% of my calls I get complains that they cannot hear me, often on the first 30s of the call. Never had any issue on iphone.

Tested also my sim card on a cheap A50 Samsung old phone, voice calls are much more clear.

[Fedezz]

Same problem, has anyone found a solution?

[Motty2012]

They changed the board on warranty and it sorted it

[Cafehockey]

If I hear nothing (not even muffled sound) when I use the Rcv_1stMic but can still be heard in phone calls, does this confirm a hardware issue?