We have added Phone Number Authentication using following technologies

• Facebook AccountKit (FAQ: https://developers.facebook.com/docs/accountkit/faq/)
• Firebase Custom Authentication (You must upgrade your Firebase plan from Free plan to any other plan)

Enabling AccountKit on Facebook App

Add AccountKit Plugin to your project

cordova plugin add cordova-plugin-accountkit --save --variable APP_ID="123456789" --variable APP_NAME="myApplication" --variable CLIENT_TOKEN="abcdefghijklmnopqrstuvwxyz"