http://faqviber.info/%D0%BA%D0%B0%D0%BA-%D0%B7%D0%B0%D0%B1%D0%BB%D0%BE%D0%BA%D0%B8%D1%80%D0%BE%D0%B2%D0%B0%D1%82%D1%8C-%D0%BA%D0%BE%D0%BD%D1%82%D0%B0%D0%BA%D1%82-%D0%B2-viber-%D0%BD%D0%B0-android-%D0%B8-iphone/Попробуйте , как тут пишут, вдруг получится)))