Samsung S6 Hissing?

[BabyWinchester]

So I had a long exposure app and was messing with the setting on it with my Samsung Galaxy S6 and it crashed. Though my sound was all the way off, my phone kinda vibrated and made a LOUD hissing sound. It doesn't seem to have affected my phone's functions, but why did my phone do that? Thanks! EDIT: I have had this app before on the same phone, but it's never done this. 

[orangecat]

There isn't enough information for me to provide any help. What app are we talking about? What hiss? Is it coming from the phones internals or the speaker?

[TheEpicDuck]

Probably comes from the camera. Try opening the camera app when you have the phone close to your ear. My s6 edge made a hissing noise when opening the camera. It's Normal.