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Viber is an instant messaging service similar to Skype that offers free texting, calling and sharing of photos, videos and audio. When you install Viber on your smartphone all your contacts are immediately recognized and if any of the contacts has Viber installed on their smartphone you two will be able to get in touch freely using Wi-Fi and 3G. This way you don't have to search and add friends. It has a very rich functional interface and you can customize your conversations, emoticons, set online status, manage notifications and block people.