https://www.cnbc.com/2017/09/27/apple-says-a-fix-for-crackling-iphone-8-earpiece-issue-is-coming.html

Apple told CNBC it will be releasing a fix for a disruptive sound in the earpieces of some iPhone 8 and iPhone 8 Plus smartphones during phone calls, an issue reported by The Verge.

"Dozens" of users are reporting online that the earpieces makes a "crackling" or "static" sound that "disrupts the audio" when they make calls, the technology website reported.