Suggestion: add phone number in a Firebase Chat Demo

Components

Chat Firabase demo allows you to send and receive messages in real-time using the Firebase service. This app implements a push notification thanks to the Firebase Cloud Messaging service. You can sign up using your Email or you can sign in using your Google account.

But before we go in, I want to add a phone number.

Proposal

I would like to suggest adding a phone number that will connect directly to the users of this app.

Mockups / Examples

Addition of phone number, when first register

After signing up using a phone number, open profir, below will be listed our phone number

Open a contact, any registered phone number will be visible

Benefits

With the connection of the phone number, the user will find it easier to know that friends who are in contact already registered in this app.
And by knowing that it is registered, we can chat with it through this application.
In addition, the phone number already registered, can also be a username to login.