The Viber App also provide for groups chats, whereby users can create groups with as many as 20 members. Furthermore, the Viber Out Credits can be used for making calls to landline and mobile numbers that are non-Viber at a relatively cheaper rate. This app is available for many platforms and smartphones. The app is optimized for and compatible with Android Tablets. You can use it simultaneously on your phone and tablet.
On the Viber App, your ID is your phone number. This app will also auto-sync with the contact list in your mobile phone, and thereby automatically detecting the contacts that already have Viber.