It found out that before been discarded, data collected by Apple to improve its voice-driven Siri service is anonymized and kept on the company’s servers for up to two years .
The fact is your commands are uploaded to Apple for analysis. Apple then assigns you a random number, which it associates with your voice files. It’s this random number – not your Apple ID or e-mail address – that gets stored on the backend.
After six months or if you simply turn Siri off, Apple will disentangle the number from your Siri files, severing all ties with you. The files themselves will stick around for another 18 months as Apple uses them for testing and product improvement.

The fact that Siri data must be sent to Apple before it can provide results has been a concern for security advocates, as well as some companies. For example, last year it was revealed that security-conscious IBM barred the use of Siri on its corporate networks, out of concern that sensitive information could leak.






