# Introduction to mobile tagging

You can set up data collection in a mobile app through Google Tag Manager.
Tag Manager allows you to modify the way you set up your app without needing to
rebuild and resubmit the app code to app marketplaces. Most of the time, you
won't need to write a single line of code when you use Tag Manager.

## Before you begin

Before you can use Tag Manager in your mobile app, set up the
[Google Analytics for Firebase SDK](https://firebase.google.com/docs/analytics),
which enables you to send app data to Google Analytics. You can also send
your app data to the products you integrate with Google Analytics. Once you
install the SDK, you can use Tag Manager to modify your data collection setup.

## Next steps

- [Google Tag Manager for Android](https://developers.google.com/tag-platform/tag-manager/android/v5)
- [Google Tag Manager for iOS](https://developers.google.com/tag-platform/tag-manager/ios/v5)