Has my microphone been hacked? Please help!

This afternoon my phone was sitting next to me on my desk with the screen locked not being used. The screen lights up suddenly, and I hear voices in a foreign language (it sounded Asian) talking and then laughing. The orange microphone light was on at the top front of the phone and the talking stopped when I picked up my phone. I began to check through my apps I had open in the background, thinking maybe I had a video or music left open, but they were all closed. It’s really freaked me out. My phone has never “jailbreaked” I believe the term is (sorry I might have that wrong). Any advice would be greatly appreciated!