When I get called via phone or try to call someone else, I can not hear the other person. The loudspeaker itself works fine, but not during a call. I can switch to the speaker or to a bluetooth headset which also works fine.
Any ideas? I already restarted the device including removing the battery once - no change.
Other apps don’t work. Also in Signal it did not work. The hardware test did not show any errors either.
The only solution: factory reset - on a new phone I just got about a week agot
Now it works again - but setting everything up again is really no fun. I know have to contact my bank again so they send me a new QR code via postal mail to re-enroll the banking app and setting up all the accounts (Nextcloud, DAVx5 etc.) will also take a couple of hours. This is one of the aspects of Android which is really very annoying - no real backup.
My bootloader is locked, because otherwise the banking apps won’t work. And yes, I did try safe mode first as well - also in safe mode it did not work.
In the phone app there is a setting in Accessibility → Hearing aids (Turn on hearing-aid compability). This was turned on - I don’t know why, maybe I accidentally enabled it.
After I have turned this off again, everything works again as expected.