Vodafone did not name the six for legal reasons. It added that in Albania, Egypt, Hungary, India, Malta, Qatar, Romania, South Africa and Turkey it could not disclose any information related to wiretapping or interception.
The Vodafone report, which is incomplete because many governments will not allow it to disclose requests, also linked to already-published national data which showed Britain and Australia making hundreds of thousands of requests.
It showed that of the countries in which it operates, EU member Italy made the most requests for communication data.