Legal requests need at least one unique identifier to make a request. First and last name is rarely enough; there are too many people with the same name and th

Legal requests need at least one unique identifier to make a request. First and last name is rarely enough; there are too many people with the same name and the proper response to that kind of request is "we can't identify a unique subscriber with that information". Email addresses, user IDs, phone numbers, profile urls, screen names, etc. are the kinds of unique identifiers for specific service providers. Not every online service records phone number or email address though, so identifiers are generally chosen specifically for each service when making a legal request. https://www.apple.com/legal/transparency/ https://www.apple.com/legal/transparency/ if you pick the drop-down for Account shows about a 60% success rate; in the other 40% of cases there's nothing to alert a user about because no data was produced, for a few possible reasons. The legal team comes up with a review process for requests and how to respond to each kind under different circumstances. Presumably Google and Facebook have similar transparency reports.