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WhatsApp to add voice calls after Facebook acquisition

Whatsapp Chief Executive Office and co-founder Jan Koum holds up a mobile phone as he delivers a keynote speech at the Mobile World Congress in Barcelona February 24, 2014. REUTERS/Albert Gea

Whatsapp Chief Executive Office and co-founder Jan Koum holds up a mobile phone as he delivers a keynote speech at the Mobile World Congress in Barcelona February 24, 2014. REUTERS/Albert Gea

Whatsapp Chief Executive Office and co-founder Jan Koum holds up a mobile phone as he delivers a keynote speech at the Mobile World Congress in Barcelona February 24, 2014. REUTERS/Albert Gea
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WhatsApp Chief Executive Officer and co-founder Jan Koum holds up a mobile phone as he delivers a keynote speech at the Mobile World Congress in Barcelona February 24, 2014. REUTERS/Albert Gea

WhatsApp Chief Executive Officer and co-founder Jan Koum holds up a mobile phone as he delivers a keynote speech at the Mobile World Congress in Barcelona February 24, 2014. REUTERS/Albert Gea

WhatsApp Chief Executive Officer and co-founder Jan Koum holds up a mobile phone as he delivers a keynote speech at the Mobile World Congress in Barcelona February 24, 2014. REUTERS/Albert Gea
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