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After six months, your request history is dissociated from the random identifier and may be retained for up to two years to help Apple develop and improve Siri, Dictation, and other language processing features like Voice Control. Your request history may include transcripts, audio for users who have opted in to Improve Siri and Dictation, and related request data, such as device specifications, performance statistics, and the approximate location of your device at the time the request was made.
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Your request history is associated with a random, device-generated identifier for six months. In addition, other Siri Data, such as computer-generated transcriptions of your requests, names of your contacts, apps installed on your devices, and location, is also used to improve Siri. For general text Dictation performed on device (for example, composing messages and notes, but not dictating in a search box), transcripts and audio are not shared with Apple by default, but are shared if you opt in to Improve Siri and Dictation. If you opt in to Improve Siri and Dictation, the audio of your interactions with Siri and Dictation may be stored on Siri servers and reviewed by Apple employees to develop and improve Siri, Dictation, and natural language processing functionality in Apple products and services.