iOS 12 Diagnostic Privacy Data Sharing

In iOS 12, Apple provides users with granular controls over the diagnostic and usage data they can share to help improve the operating system, first-party services, and third-party applications. This article outlines the specific categories of diagnostic privacy data users can choose to transmit to Apple, including system performance logs, app developer metrics, iCloud usage patterns, and health-related diagnostics, along with the privacy mechanisms used to anonymize this information.

iPhone Analytics and System Performance

When users enable "Share iPhone Analytics" in iOS 12, the device automatically collects and transmits daily diagnostic and usage metrics. This data includes:

  • Hardware and Operating System Specifications: Details regarding device model, OS build version, memory capacity, and connected peripheral accessories.
  • Performance Metrics: Information on battery life degradation, system responsiveness, network connection reliability, and unexpected kernel panics or system reboots.
  • Usage Statistics: General metrics regarding which native features, settings, and interface elements are used, collected using Differential Privacy techniques to obscure user identity while identifying broad usage trends.

App Developer Diagnostics

Users can also toggle the option to "Share with App Developers." This permits Apple to distribute relevant diagnostic information to third-party developers whose apps are installed on the device. Shared information is restricted to:

  • Crash Logs: Reports generated when an application hangs or terminates unexpectedly, showing the state of the app code at the moment of failure.
  • Usage Data: Aggregated metrics regarding how frequently specific app features are engaged, stripped of any personally identifiable user content.

iCloud Analytics

The "Share iCloud Analytics" toggle allows users to share data derived from their cloud-connected services. iOS 12 uses this data to enhance intelligent features and services like Siri. This data includes:

  • Measurements of how iCloud accounts and linked services are accessed across devices.
  • Text and query performance patterns, which are aggregated and stripped of personal account identifiers before transmission.

Health and Fitness Diagnostics

iOS 12 includes distinct opt-in options for users wishing to contribute to medical and fitness software improvements:

  • Improve Health & Activity: Transmits measurements on the performance of the Health and Activity apps, motion sensor accuracy, and workout logging.
  • Improve Health Records: Gathers diagnostic metrics on how the Health Records feature interacts with healthcare provider portals. This data excludes clinical notes, personal medical histories, and personally identifiable health data.

Location-Based Diagnostics

Under location privacy settings, iOS 12 allows the sharing of location-derived diagnostic data:

  • Frequent Locations and Routing: Anonymized GPS and sensor metrics sent to improve Apple Maps routing, traffic prediction, and localized search results.
  • Wi-Fi and Cellular Diagnostics: Signal strength and tower connection events to help Apple refine regional network performance databases.

All diagnostic data collection in iOS 12 is optional, turned off during initial device setup unless explicitly enabled, and managed through Settings > Privacy > Analytics. Diagnostic logs associated with these settings utilize rotating, non-personal identifiers that are not linked to a user's Apple ID.