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"The information we collect includes unique identifiers, browser type and settings, device type and settings, operating system, mobile network information including carrier name and phone number, and application version number. If you're using an Android device with Google apps, your device periodically contacts Google servers to provide information about your device and connection to our services. This information includes things like your device type and carrier name, crash reports, which apps you've installed."

Google collects a broad range of device data including installed apps, carrier information, phone number, and unique device identifiers, much of which goes beyond what's needed for core service functionality.

"Depending on the products you're using and settings you choose, Google may use different types of location information to help make some services and products you use more helpful. These include: GPS and other sensor data from your device, IP address, Activity on Google services, such as from your searches or places you label like home or work, Information about things near your device, such as Wi-Fi access points, cell towers, and Bluetooth-enabled devices."

Google uses multiple location tracking methods including GPS, IP geolocation, WiFi access points, cell towers, and Bluetooth proximity, creating comprehensive location profiles of users.

"We may use the information we collect across our services and across your devices for the purposes described above. Depending on your account settings, your activity on other sites and apps may be associated with your personal information in order to improve Google's services and the ads delivered by Google."

Google explicitly links user activity across all its services, devices, and third-party sites that use Google services, building comprehensive cross-service user profiles.

"We provide personal information to our affiliates and other trusted businesses or persons to process it for us, based on our instructions and in compliance with our Privacy Policy and any other appropriate confidentiality and security measures. We also allow specific partners to collect information from your browser or device for advertising and measurement purposes using their own cookies or similar technologies."

Google shares personal information with affiliates and third-party processors, and allows advertising partners to directly collect data from users' browsers and devices via their own tracking technologies.

"We keep some data until you delete your Google Account, such as information about how often you use our services. And some data we retain for longer periods of time when necessary for legitimate business or legal purposes, such as security, fraud and abuse prevention, or financial record-keeping. When you delete data, we follow a deletion process to make sure that your data is safely and completely removed from our servers or retained only in anonymized form. Because of this, there may be delays between when you delete something and when copies are deleted from our active and backup systems."

Google retains some data indefinitely until account deletion, retains other data even longer for broad 'business or legal purposes,' and acknowledges delays in actually deleting data from backup systems.

"We change this Privacy Policy from time to time. We will not reduce your rights under this Privacy Policy without your explicit consent. We always indicate the date the last changes were published and we offer access to archived versions for your review. If changes are significant, we'll provide a more prominent notice (including, for certain services, email notification of Privacy Policy changes)."

While Google commits to not reducing rights without consent, it can still make other policy changes unilaterally with only a notice, and continued use of services implies acceptance of changes.