Can I use headphones that are not original whiles using ios16

I'm not sure what you mean by "not original?" If you mean can you use headphones not made by Apple, yes you can. If they are Bluetooth, you just follow the directions provided by the manufacturer to put them in pairing mode in order to connect with your iPhone.

If this isn't you meant, please more details.

If you have a Bluetooth device, you can pair it with your iPhone like normal and it will work. I don't know if you mean if fake AirPods that can't be verified can connect with your iPhone, so can you be more specific?