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Anubhav Nayyar, country manager India, Viber, said, “We partnered with Zenithoptimedia Group as we really liked their thinking and strategic approach to our marketing challenges as well as their excellent track record of helping create new age brands like Micromax and OLX.”

With over 200 million users, Viber is among the fastest-growing mobile calling app. On mobile phones it competes with rivals such as Whatsapp, Line and WeChat. Viber has expanded beyond the small screen to tap users on desktops and tablets as well, taking the fight to traditional voice-over-internet players such as Skype (now owned by Microsoft ).