“Skype is modeled after a buddy list – you need a user ID and password, and in order to talk to someone you need to ‘add them’, get approved, etc. Viber, on the other hand, is modeled after a phone. So your ID is your phone number (authenticated via SMS) and you can call anyone, as long as you know their number.”
The coolest part about this app is that it does not have to be running in order to work. You can close the app completely – even removing it from your background services – and still receive calls. The user is sent a notification, a ringtone will sound, and as soon as you click “Answer” on the notification, the app is launched and a connection is made automatically! [chris.pirillo.com,2011]
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