What is the meaning of that icon on facebook chat?

[Aninomous]

I mean that phone icon. Why does some people has it and some people doensn't? What does that mean? And the minutes beside it?

http://25.media.tumblr.com/ac0607e508675...o1_250.jpg

[Sarah]

It means they used Facebook through a mobile phone about 57 minutes ago, or 1 hour ago (whatever the number says).

[Nestor]

if you login from mobile, a timer will start from 00:00. Every time you browse fb, the timer restarts. If you haven't browsed from mobile for a set amount of time, your name will dissapear from your friends' chat list and you will appear offline.

[Al mamun]

its also a question to me....