Hy, i am from Germany and i have still the same problem with my Iphone Xs.
I also hab the problem with my iphone X, i have changed it in the Apple Store this summer, but the new one had the same problem.
There is this crakling sound by phone calls and when i hear music in this frequences.
I buy the xs, because i have hoped it will be better, but the same Problem like the X.
Yesterday i get an iphone Xr, it sound clear and with no crackling. But i don‘t want an Xr. I bring it back to Apple next week. I only buy it to check the sound.
I there still someone who have no crackling?