* COMPLETELY FREE AND WITH NO ADS: Viber and all Viber features are absolutely free and do not require any additional “in application” purchase. Once you and your friends install the free Viber application, you can use it to talk and also text as much as you want. Just makes sure all your friends get Viber! All you need is an Internet connection: 3G or Wi-Fi where available. On top of that, Viber doesn’t contain any annoying ads.
* NO INTERNATIONAL CHARGES: It doesn’t matter where you or your friends are, be it on the same network or in a totally different country. You can talk for as much as you want, for free. Just make sure your friends have Viber too.

* NO USERNAMES, PASSWORDS OR REGISTRATION: You know your friend’s phone number, so why bother with yet another username and password? Viber uses your phone number as your “identity” and lets you make free Viber phone calls to any of your friends that have Viber – using THEIR phone number.

* NO NEED TO ADD BUDDIES: Unlike applications like Skype, Windows Live Messenger or Fring where you need to “add buddies” and have them approve you, Viber behaves just like a phone. Just like you don't need to “add” someone in order to call them, you don't need to add your friends in order to call them on Viber. If you know their phone number, then you know their Viber number, and you’re ready to go!
* DON’T KILL YOUR VIBER: To make sure you always get incoming calls/messages notifications, we strongly recommend you to keep Viber running in the background. This doesn't drain your battery or use up memory and improves your Viber experience.

* SOUND QUALITY: Viber uses state of the art technology in order to make sure the sound quality you get is much better than GSM or a regular phone call.

* MUCH MORE COMING: We are hard at work bringing many more features to your Viber phone. More ringtones (and custom ones), wallpapers, location based services and more are all coming soon to Viber!