Iphone

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See: Status icons and symbols on your iPhone - Apple Support.

From the article,

An orange indicator  means the microphone is being used by an app on your iPhone.

Jack

In some phones, the yellow dot might look like an orange dot and it means that an app is using the microphone.

If you see a green dot in the same place, it then indicates that an app is using the camera. It is a security awareness feature(s).

Axel F.