Demonstrates how to use the firebase_auth plugin.

1. Enable phone authentication in the Firebase console.
2. Add test phone number and verification code to the Firebase console.

• For this sample the number +1 408-555-6969 and verification code 888888 are used.

1. For iOS set the URL Schemes to the REVERSE_CLIENT_ID from the GoogleServices-Info.plist file.
2. Click the Test verifyPhoneNumber button.

• If APNs is not enabled or a simulator is being used, verification will be done via a Captcha.

1. Once the phone number is verified the app displays the test verification code.
2. Click the Test signInWithPhoneNumber button.
3. Signed in user's details are displayed in the UI.

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