iPhone 6s earpiece crackling during call
 

Hello, Have one here, earpiece replaced, flex etc. All is fine on voice recording, but during a call sound is cracking. You could here only some words.
any idea where to start ?
Any help would be very appreciated!
Thank you

U3500 is the audio codec for Earspeaker, headphone and all your 3 mics. I would reflow this ic with 370 degrees celcius heat and some Flux and make sure to cover your wifi ic.

I think, the problem is in the Network section. Check network section