Mass cellphone surveillance experiment in Spain
"With a court order, this data can be used to identify and track an individual...
... which means that it is stored de-anonymized in the carrier servers"No, it does not mean that it's stored de-anonymized. It means that it can be de-anonymized if required by a court order.EDIT because all the downvotes, this is not nitpicking. The deanonymizing data is ELSEWHERE, not on the servers. It takes a court order to obtain it, employees cannot use it. It's an important point.