As long as you use the Google Mobile Ads SDK, you don't need to write any additional code to collect a number of user properties automatically. While these properties may not be found in AdMob reporting, they will be available upon linking to Firebase. In Firebase, all of these user properties are available for use in Audience conditions, and some of them are also available as general report filters.
For iOS apps, the app must collect IDFA in order to automatically derive the Age, Gender, and Interests properties.
|Age||Text||Identifies users by six categories: 18-24, 25-34, 35-44, 45-54, 55-64, and 65+.|
|App Store||Text||The store from which the app was downloaded and installed.|
|App Version||Text||The versionName (Android) or the Bundle version (iOS).|
|Country||Text||The country the user resides in.|
|Device Brand||Text||The brand name of the mobile device (e.g., Motorola, LG, or Samsung).|
|Device Category||Text||The category of the mobile device (e.g., mobile or tablet).|
|Device Model||Text||The mobile device model name (e.g., iPhone 5s or SM-J500M).|
|First Open Time||Number||The time (in milliseconds, UTC) at which the user first opened the app, rounded up to the next hour.|
|Gender||Text||Identifies users as either male or female.|
|Interests||Text||Lists the interests of the user (e.g., "Arts & Entertainment, Games, Sports").|
|Language||Text||The language setting of the device OS (e.g., en-us or pt-br).|
|New/Established||N/A||New: First opened the app within the last 7 days.
Established: First opened the app more than 7 days ago.
|OS Version||Text||The version of the device OS (e.g., 9.3.2 or 5.1.1).|