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Building Apps with Contacts & Sign-In

These lessons teach you how to include contact information and authenticate users with the same credentials they use for Google. These features allow your app to connect users with people they care about and provide a personalized experience without creating new user accounts.

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This doc is hidden because your selected API level for the documentation is . You can change the documentation API level with the selector above the left navigation.

For more information about specifying the API level your app requires, read Supporting Different Platform Versions.

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