After raising questions about Siri's privacy policy, Wired received a response from Apple spokeswoman Trudy Miller that confirmed Apple anonymizes Siri data and stores it for up to 24 months.
According to the Wired report, your iOS device records what you say to Siri and sends that clip to Apple's servers for analysis. As part of the voice recognition translation and response, Apple assigns a set of random numbers to the clip to identify the user from which it originated. This number is used during the back-end voice processing to make sure the response is sent back to the correct phone.
Apple stores this clip along with the random numbe
