Hi @ankititsignups,
Welcome to the Auth0 Community and thank you for your post!
You are correct when mentioning that Auth0 treats users signing in from a different connection as individual users. However you can achieve a unified user profile by implementing one of the options presented under our Link User Accounts documentation.
You also have the option of enabling the phone number as a Primary Identifier. You can check out the Flexible Identifiers feature, which allows you to choose from email, username, phone, or a combination of two or more to uniquely identify your users.
Best regards,
Remus