# Set up authentication using Anonymous Sign-In

## Android

1. See [Before you begin](https://firebase.google.com/docs/auth/android/anonymous-auth#before-you-begin) and follow the instructions to configure anonymous sign-in correctly.

## iOS

1. See [Before you begin](https://firebase.google.com/docs/auth/ios/anonymous-auth#before-you-begin) and follow the instructions to configure and enable anonymous sign-in correctly.

## Web

1. See [Before you begin](https://firebase.google.com/docs/auth/web/anonymous-auth#before-you-begin) and follow the instructions to configure and enable anonymous sign-in correctly.
