Trying to woo telecom operators, he said: "It is really important not to lose sight of the fact that the real companies that are driving this are the operators... The only way to accelerate that is to help operators to grow their business."
"The reason why we're here in Barcelona is because the folks who are here, who are part of this industry, are the ones leading the charge to connect everyone in the world and have been for decades," he said.
"There's a long legacy and history and sense of mission in the industry. And that's why these folks are doing all the work to lay the fibre and build the towers to actually get this done," Zuckerberg said at the Mobile World Congress here.
Through the Internet.Org app, more than 500 million people in six countries can now access useful health, employment and local information services without data charges, he said.
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In India, Internet.Org has tied with RCom to provide free access to data services.
His comments come in the backdrop of telcos complaining that search engines and social networking sites and new communication apps are piggybacking on the huge investments made by operators on their mobile and fixed-line networks.
The group seeks to work with operators to offers free or subsidised Internet access to increase usage based on the bet the operators will eventually be able to turn free users into paying customers.