iPhone

[Jill1]

Why is there an orange dot at the top of my iPhone screen?

[Nighthawk]

That is something that Apple added with iOS 14. It's related to the privacy settings. 

A green dot indicates an app you are using is accessing the camera.

An orange dot indicates an app is using the microphone.

[Jill1]

I’ve went through all my apps, and none are using the microphone?

[Nighthawk]

There may still be one. It all depends on the apps you have installed. 

From: https://www.forbes.com/sites/kateoflahertyuk/2020/09/21/ios-14-heres-why-theres-an-orange-dot-on-you...

In general, to ensure apps are not accessing your microphone or camera when they don’t need to be, you can easily view who has asked to access these. Go to Settings > Privacy > microphone/camera and you can deny access to those who don’t need it to function. You can also see which apps have used your microphone or camera in the Control Center.