Mobile App Development

Firebase Phone number authentication IONIC (Android):

This article explains how to do a phone number authentication in Android mobile app.

Step 1:

First sign into the below Firebase link using Google credentials.

We can create new projects using ‘Create a Project’.

Phone number authentication - step 1

Disable the Google analytics toggle bar as we are not using Google Analytics and proceed to Add Firebase

Phone number authentication - step 1A

Step 2:

The created project gets displayed in the console. After selecting the project screen, the below screen is displayed.

Phone number authentication - step 2

Here we are going to add an Android App by selecting the android icon.

We should add an Android package name, because this is a mandatory one. SHA1 also can add for phone number authentication.

Phone number authentication - step 2A

How to get SHA1?

In the Mac system use the below command in terminal to get SHA1 key

keytool -list -v -keystore ~/.android/debug.keystore -alias androiddebugkey -storepass android -keypass android

Phone number authentication - step 2B

Step 3:

Download google-service.json file and add to the project folder.

Phone number authentication - Step 3

Step 4:

Next we can go to the Authentication section under project in Firebase console. Firebase has multiple authentication methods, we can enable the phone option and save it.

Firebase provides an option for Phone numbers for testing. We can enter a random number and provide a static password for it. In this scenario Firebase won’t send OTP every time, but will send the Verification code after that we can use the static OTP, which we already provided in Firebase.

Phone number authentication - step4

Step 5:

Here we needed to create a web app for Firebase config, and to this config add as a parameter in firebase initializeApp method.


// Your web app’s Firebase configuration

var firebaseConfig = {

apiKey: “AIzaS**********************”,

authDomain: “***-********”,

databaseURL: “https://***********”,

projectId: “****************”,

storageBucket: “****************.com”,

messagingSenderId: “****************”,

appId: “1:****************:9****************f09”


// Initialize Firebase