BARCELONA: WhatsApp will add free voice-call services for its 450 million customers later this year, laying down a new challenge to telecom network operators just days after Facebook Inc scooped it up for US$19bil (RM57bil).
The text-based messaging service aims to let users make calls by the second quarter, expanding its appeal to help it hit a billion users, WhatsApp CEO Jan Koum said at the Mobile World Congress in Barcelona.
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