ok when your on Facebook through your phone?

[Sara]

Or computer and see that people are online when your on the computer will it show the green icon if someone is on the computer and will it show a green icon if someone is using there phone like if I'm on my phone it shows active friends and if I go into someone's profile it shows the green icon and when I go on the computer it shows the green icon to so how do I tell if that person is using a computer or cell phone