Just another data point - 256gb iphone 8+, silver, verizon. Most calls with subtle crackling. I plan to return if there is no software fix within the 14 day return period. Feel as though getting a second device will be a crapshoot and it seems most are still having issues irregardless. Have tried all the tricks posed in the prior 20 pages of this forum - nothing works.
Double sucks, cuz my iphone 6s is waiting to get an activation lock issue fixed - others have reported on a separate forum - where, despite having purchased the phone myself from apple, an unknown email is associated with icloud. Super annoying. No need to discuss this issue here on this forum though...