There are multiple reports of the iPhone 7 making hissing noises like a snake. Gizmodo has a news roundup here, but the gist is that 512 Pixels’ Stephen Hackett noticed it and several others have followed up to say they’re hearing the same thing.
It’s one of those issues that could rise to a critical level. It also could not be a big deal at all, which is iMore’s analysis. But in a quiet room, with the phone under heavy load, this is what Hackett recorded, and it is not a normal or a pleasing sound to be with. Apple declined to comment on this story.
It is not widespread and its been reported in smaller number, So for the answer to the hissing noise problem we have to wait for Apple’s official statement.