There are many countries like Albania, Egypt, Hungary, India, Malta, Qatar, Romania, South Africa and Turkey, where it's against the law to disclose whether surveillance is happening and some of them have empowered their Intelligence agencies to conduct mass surveillance legally without any warrant.
The Guardian reported that Vodafone is not alone, in some countries the law obliges carriers to install direct access pipes to their data centers, or at least gives governments the power to do so.
These wires are typically attached directly to the company's central data centre or the company's telecoms switches, allowing agencies to listen to or record live conversations and other electronic communications.
“In our view, it is governments - not communications operators - who hold the primary duty to provide greater transparency on the number of agency and authority demands issued to operators,” Vodafone said.
Different Government count warrants in different ways, so the company also warned that its hard to conclude about the level of surveillance in a country, 'as each warrant can target any number of different subscribers, different communications services, and devices.'
Vodafone can not reveal the identities of such countries because certain regimes could imprison its staff as a result, but Privacy campaigners have praised Vodafone and called for other companies to follow Vodafone's example.