iPhone 7’s Are Hissing Like Snakes
There are reports of iPhone 7 hissing sound that is said to emanate from the new handset when the processor is being pushed to the limit. It is not been reported on alarming rate but problem is out there and Apple declined to make any statement about it.
512 Pixels’ Stephen Hackett first talked about this issue and he was later backed up by reports from multiple users who claimed to be hearing the iPhone 7 hissing sound.
Hackett said that when he talked to AppleCare about it he was offered a replacement. Aside from the speakers and earphone, there’s nothing on the processor or related components which would generate an audible sound. It could be a result of an RF transmitter or some kind of interference with the speaker system.