ETA - This is an Iphone 7 Plus - 256gb matte black I'm assuming this is tied to the whole "Hiss Gate" thing but while recording videos I consistently get high-frequency pitches and chirps. Does this occur with anyone else? I've been in touch with Apple Care/Support Engineers and even Executive Relations and they don't seem to have a clue here. Here is an example video I made in an isolated, quiet environment. (Under bed covers.) if you put your volume up you should be able to audibly hear it. I've tested noise cancellation on and off, no change. I've gone through multiple phones regarding this hissing, and sadly, all of them hiss to an extent and apparently it comes out in video recordings too. This is my first iPhone in years after moving from Android and I must say, I'm really starting to regret it.