Wed Apr 4, 2012 9:02am BST * Startup had 18 percent of 2011 messaging bandwidth-report * Carriers lost $14 billion in SMS revenue last year-report * Co-founder says carriers win by selling more data plans By Jeremy Wagstaff SINGAPORE, April 4 (Reuters) - U.S.-based software startup WhatsApp, the fast-growing mobile messaging service, denies it's a…
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