Whenever you speak into Apple’s voice activated personal digital assistant, it ships it off to Apple’s data farm for analysis. Apple generates a random number to represent the user and it associates the voice files with that number. This number — not your Apple user ID or email address — represents you as far as Siri’s back-end voice analysis system is concerned. Once the voice recording is six months old, Apple “disassociates” your user number from the clip, deleting the number from the voice file. But it keeps these disassociated files for up to 18 more months for testing and product improvement purposes.On the other hand, for example, wireless carriers keep hold of the user data under the form of text message history and store them for up to five years! If it offers you any peace of mind, all data is anonymised. Nicole Ozer, ACLU lawyer, advises iPhone and iPad users who use Siri to be careful what they say to her:
Transcripts of what you say to Siri could reveal sensitive things about you, your family, or business. Siri works for Apple, so make a note to yourself to really think before you speak.I hope this has shed some light on the matter. I'm personally not worrying about this now, as I don't intend to share any of my state secrets with Siri and don't intend to commit any robberies, murders or kidnappings in the near future.