A man is seen next to a Firefox logo at a Mozilla stand during the Mobile World Congress in Barcelona, in this February 28, 2013 file picture. A paper released by the mobile industry's GSM Association... more 
A man is seen next to a Firefox logo at a Mozilla stand during the Mobile World Congress in Barcelona, in this February 28, 2013 file picture. A paper released by the mobile industry's GSM Association ahead of this week's congress in Barcelona noted that at least 36 telecoms operators had pledged support for one of the four open source challengers - Firefox, Ubuntu, Tizen and Sailfish. But the GSMA said that if anyone is to make a dent it needs to win at least 5 percent market share within the next year or so "to have a chance of being a long-term competitor." Leading the charge at Barcelona is Mozilla Corp, best known for its open source Firefox browser, and whose Firefox mobile OS is already on three devices sold by four operators in more than a dozen markets. To match story MOBILE-WORLD/OS REUTERS/Albert Gea/Files (SPAIN - Tags: SCIENCE TECHNOLOGY BUSINESS TELECOMS) less 
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Reuters | Photo By ALBERT GEA / REUTERS
Mon, Feb 24, 2014 1:27 AM EST