By Sam Schechner and Simon Zekaria 

LONDON-- Vodafone Group PLC said government agencies in multiple countries have direct access to the global carrier's infrastructure, allowing them to listen to conversations on its networks, sometimes requiring little or nothing in the way of formal requests.

The disclosure came in a report published Friday that provides one of the most comprehensive surveys so far of broad government access to voice calls and other data moving across global telecommunications networks. The report offers new details on hundreds of thousands of requests for wiretaps and user data across Vodafone's global footprint, and lays out in general terms the procedures governments use to request information, often with little disclosure.

Vodafone's overview--covering 29 countries--is the latest in a wave of disclosures that paint a more complete picture of how phone companies cooperate with intelligence services around the world. Several companies, including AT&T Inc. and Verizon Communications Inc. in the U.S., have in recent months joined U.S. tech companies in disclosing information about intelligence requests, in an effort to limit the fallout of leaks by former U.S. National Security Agency contractor Edward Snowden.

Vodafone, the world's second-largest mobile carrier after China Mobile Inc., didn't disclose information about surveillance in the U.S., despite owning until recently a minority stake in Verizon Wireless. But because of the number of countries where Vodafone does operate, the company's report provides what some privacy activists said was the broadest survey to date of practices used by other governments around the world--from a firm with firsthand experience in complying with their orders.

"It would appear to be the most comprehensive report issued thus far by a telecom," said Jonas Kron, senior vice president at Boston-based Trillium Asset Management, which focuses on socially responsible investing. "Vodafone's discussion of direct government connections to its network raises serious concerns about government practices, and what telecoms can do to protect human rights."

London-based Vodafone said that in six countries where it operates, governments have direct wires connected to its network, allowing live conversations to be listened to and recorded by government entities. It said some governments also have the ability to track the location of a mobile customer. In some cases, the governments don't have to make an interception request for the data, and access it directly from Vodafone's infrastructure, it said.

In those six countries, the direct tapping is a legal requirement. Vodafone said it isn't disclosing the names of those countries for fear of local sanctions and retaliation by governments against its staff.

The report could serve as a counterpoint to European governments that have accused companies of cooperating too willingly with the U.S. government following leaks by Mr. Snowden. An annex to the report details individual countries' laws, including one approved late last year in France, that allows government investigators to request a wide array of user data from telecom and Internet firms without a judge's authorization.

"In our view, it is governments--not communications operators--who hold the primary duty to provide greater transparency," Vodafone wrote in its report.

Vodafone said the requirements it disclosed Friday apply to all carriers in the countries named, not just Vodafone. Indeed, European intelligence services make frequent use of the telecommunications networks in their territories as well as overseas, seeking data on the location of targets as well as the content of communications, one former European intelligence official said.

"Everything that goes over our network...we can be required to intercept, tap," a European telecom executive said, adding that with the right tools intelligence services can "see, for example, your browsing history, where you're going, what you're posting."

Tech and telecom firms have been under pressure on both sides of the Atlantic to give more information about how they interact with governments and law-enforcement agencies where they operate. U.S. tech firms, for instance, have for several years published data on censorship, and earlier this year won an agreement from the U.S. government to disclose limited information about orders they receive from the Foreign Intelligence Surveillance Court, a specialized tribunal for national-security matters whose decisions typically are secret.

Telecom firms have generally recently been less forthcoming about their dealings with governments. But the scope of Vodafone's report could put fresh pressure on other carriers in Europe and the U.S. to provide more information about how they handle such requests, activists and officials said.

"Now would be a good time for other telecoms companies to be transparent about what they are sharing with governments," said one European Commission official.

A spokesman for BT Group PLC, a fixed-line operator in the U.K., said: "We do not comment on matters of national security. We comply with the law in the countries where we operate." Deutsche Telekom, which earlier this year released a transparency report for Germany, said it is exploring issuing a similar report for other countries where it operates. Orange SA said it "rigorously adheres to the legal framework with regards to all surveillance requests emanating from state authorities across its footprint."

Some privacy advocates said that transparency reports can be a distraction from changing the underlying legal framework that permits government surveillance. "Transparency is definitely useful, but it appears to be sold as panacea for all ills," said Joe McNamee, executive director of lobby group European Digital Rights. "Transparency doesn't make right what is wrong. It does not make legal what is illegal."

One problem companies face is the limited amount of data they are allowed to disclose, which makes comparisons difficult. Italy, for instance, topped other countries in Vodafone's survey with 606,601 requests for "communications data" in 2013. But the company notes that a single request can cover multiple users, or a user can be the subject of multiple requests.

Moreover, Vodafone said it is unlawful to disclose any information related to wiretapping or interception of the content of phone calls and messages in Albania, Egypt, Hungary, India, Malta, Qatar, Romania, South Africa and Turkey. It disclosed no numbers for those countries.

Vodafone said it published the information now to further the debate on government surveillance systems, and will update the report annually. Vodafone said that while its customers have a "right to privacy" enshrined in international human-rights law, the company also must abide by the laws of every country in which it operates--including intelligence requests.

"Refusal to comply with a country's laws is not an option," Vodafone said. "If we do not comply with a lawful demand for assistance, governments can remove our license to operate, preventing us from providing services to our customers."

Lisa Fleisher and Frances Robinson contributed to this article.

Write to Sam Schechner at sam.schechner@wsj.com and Simon Zekaria at simon.zekaria@wsj.com

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