Most smartphones even without the additional bloatware have pre-installed apps like Google’s suite of apps and Microsoft apps.
As for apps that may have been used once in a while, data like timestamps of when you used the app and the duration are shared with Google Analytics.
The list of apps installed on the devices can also reveal the user’s preferences and traits, and this list of apps can act as a handset fingerprint which can then be used for tracking.
[Via]
