I am also facing the same issue.
I am currently on .58
1.I have resetted my phone.
2.Tried different earphones.
3.bottom port has no dust.
Still issue is not solved, i guess its not a Hardware issue as while listening to music or playing games crackling is not there. But only while calling via earphones i I am facing this noise crackling ( its impossible to talk to person on the phone when crackling noise is appearing).
Asus team
@Gustav_ASUS @Anders_ASUS @laura please fix this issue ASAP.
Thank you.