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"WhatsApp, the hot mobile messaging app of the moment, plans to offer free voice calling later this year.\nJan Koum, the WhatsApp cofounder and CEO, announced the news during a presentation at Mobile World Congress. Koum said the Internet calling feature would roll out in the second quarter, starting with Android and iOS, according to the New York Times.\nSee also: The $6.8 Billion Man: WhatsApp CEO's Path from Poverty to Riches\nThe announcement marked Koum's first public appearance since Facebook announced last week that it plans to acquire WhatsApp for $16 billion. Assuming the deal goes through, Koum will reportedly be worth more than $6 billion.\nWhatsApp launched in 2009 and took off in a number of countries abroad as a text message replacement tool. The decision to add voice calling puts WhatsApp in league with other messaging services like Viber, Kik and Skype.\nDuring the talk, Koum also revealed that WhatsApp now has 465 million users, up from around 450 million users just last week. At this pace, WhatsApp will likely hit one billion users much faster than Facebook did.\n\n\nMobile World Congress 2014\n\n\n\n\n\n\n\nBlackphone\nThe Blackphone, seen here in Barcelona, Spain, uses some of the most advanced privacy security on the consumer smartphone market, but it's not exactly NSA-proof as has been claimed.\n\nImage:  Mashable, Nina Frazier-Hansen\n\n\n\n\n\n\n\n\nOpera Max Browser\nOpera unveiled a new mobile browser, which claims to reduce bandwidth usage on your android phone.\n\nImage:  Mashable, Stan Schroeder\n\n\n\n\n\n\n\n\nSamsung Galaxy S5\nSamsung unveiled the Galaxy S5, which sports a fingerprint scanner and water-resistant casing.\n\nImage:  Mashable, Stan Schroeder\n\n\n\n\n\n\n\n\nSamsung Gear Fit\nIn addition to the Gear 2 and the Gear 2 Neo, Samsung unveiled the Gear Fit. The company's third wearable of Mobile World Congress is lighter than its companions and sports a 1.84 AMOLED curved touchscreen with a 432x128 pixel resolution.\n\nImage:  Mashable, Stan Schroeder\n\n\n\n\n\n\n\n\nMark Zuckerberg Keynote\nMark Zuckerberg spoke on the future of WhatsApp and Facebook's plans for Internet.org at the Mobile World Congress Keynote.\n\nImage:  Mashable, Nina Frazier-Hansen\n\n\n\n\n\n\n\n\nMark Zuckerberg Keynote\nAsked about future plans to pursue Snapchat, Zuckerberg joked that he was done purchasing companies for a while.\n\nImage:  Mashable, Nina Frazier-Hansen\n\n\n\n\n\n\n\n\nYotaPhone\nThe dual-screen YotaPhone features a rear-facing e-ink display in addition to the main LCD.\n\nImage:  Mashable, Stan Schroeder\n\n\n\n\n\n\n\n\nNokia Asha 230\nNokia unveiled the newest addition to its Asha line, the 230. This tiny budget Windows phone updates both the Asha line's hardware and software.\n\nImage:  Mashable\n\n\n\n\n\n\n\n\nNymi\nNymi is a wearable bracelet that reads the user's heart rate to authenticate identity.\n\nImage:  Mashable, Adario Strange\n\n\n\n\n\n\n\n\nSamsung Gear 2\nSamsung's new smartwatch drops the \"Galaxy\" moniker in favor of some added features: a heart-rate sensor and an IR blaster to control your TV among others.\n\nImage:  Mashable, Stan Schroeder\n\n\n\n\n\n\n\n\nSony SmartBand SWR10\nOriginally unveiled at CES 2014, Sony's SmartBand SWR10 features Lifelog, a 24 hour comprehensive tracking system.\n\nImage:  Mashable, Nina Frazier-Hansen\n\n\n\n\n\n\n\n\nZTE Open C\nZTE introduced a line of Firefox smartphones, including the Open C. \n\nImage:  Mashable, Nina Frazier-Hansen\n\n\n\n\n\n\n\n\nZTE Grand Memo II\nZTE introduced a flagship smartphone, the Grand Memo II.\n\nImage:  Mashable, Nina Frazier-Hansen\n\n\n\n\n\n\n\n\nAlcatel Idol 2\nAlcatel introduced the One Touch Idol 2, an Android 4.3 (Kit Kat) smartphone with a 5-inch display. \n\nImage:  Mashable, Nina Frazier-Hansen\n\n\n\n\n\n\n\n\nAlcatel Idol 2\nAlcatel introduced the Idol 2 mini in a range of bright colors. \n\nImage:  Mashable, Nina Frazier-Hansen\n\n\n\n\n\n\n\n\nLG G Pro 2\nLG introduced the G Pro 2 on Sunday, a device designed to give phablet lovers a significant performance upgrade. Complete with a 5.9-inch HD IPS display and a 13-megapixel camera with OIS+ (Optical Image Stabilizer Plus) it is powered by a 2.26GHz quad-core Snapdragon 800 processor and comes in Silver, White and Titan. \n\nImage:  Mashable, Nina Frazier-Hansen\n\n\n\n\n\n\n\n\nLG G2 Mini\nLG also introduced the G2 mini, a device the company is calling its first \"compact smartphone.\" The screen measures just 4.7 inches and comes with either a 1.7GHz or 1.2GHz quad-core processor and a 13-megapixel or 8-megapixel camera capable of shooting 4K video. \n\nImage:  Mashable, Nina Frazier-Hansen\n\n\n\n\n\n\n\n\nNokia X\nNokia unveiled the Nokia X, a budget-model Android phone priced at 89 euros (roughly $120). \n\nImage:  Mashable, Adario Strange\n\n\n\n\n\n\n\n\nSONY Xperia Z2\nSony unveiled the Xperia Z2, the company's new flagship smartphone, a mere four months after introducing Xperia Z1 and one year after launching the first phone in the series, the Xperia Z.\n\nImage:  Mashable, Stan Schroeder\n\n\n\n\n\n\n\n\nSONY Xperia M2\nSony also decided to upgrade its mid-range smartphone offering with the Xperia M2.\n\nImage:  Mashable, Stan Schroeder\n\n\n\n\n\n\n\n\nSONY Xperia Z2 Tablet\nSony introduced the 10.1-inch Xperia Z2 Tablet with an ultra-thin, waterproof case.\n\nImage:  Mashable, Stan Schroeder\n\n\n\n\n\n\nHave something to add to this story? 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