Share your experience!
Have you pulled down the notification bar to see if there is a message
and one thread is enough to ask the same question
He's put it in silent mode. 
Aren't you talking about the 1 in the red circle? That is website related.
If it is about the notification bar,then indeed that is silent mode. You can get out of silent mode by pressing volume button and changing to priority or vibration or normal.
No problem,ask around if you feel like.