IPhone 5s making screeching/static noise from speakers?

Yesterday I heard a screaming sound coming from my phone but I had no apps/music pulled up that could explain the noise. Not even 5 minutes ago, I went to watch a video and had a very loud static noise coming from my speaker. I turned my phone off with the lock and home button and it fixed it. What was it? What do I need to do?

Added (1). I have no money to my name, I'm a teenager. This phone was bought by my brother. So I have no way to take it to a repair shop.

Take it to a phone repair shop.

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