1. Viber need internet connection! So use public wifi whenever u can..

2. Cannnot reach, its like MSN/Skype... The tone is same online n offline..

3. No, just try send message, whenever u see status DELIVERED means he is online, but that not guaranteed the message has been read... Whenever u get SENT status, that means the person is no online.

This post has been edited by jusbella: Jun 26 2012, 01:10 PM