I am trying to setup the flow where user enters few input on sign up page for example: phone number and then signsup using one of the social connection.
I use universal login.
I am familiar with actions.
How can I render the view so user sign up atleast takes input from user about phone number (for example) and then user can choose to login with username/password or one of the supported social.
I understand you are trying to add a phone number to the user_metadata. You can use forms to capture user inputs and use actions to call them. Any action trigger should be able to trigger a flow. There are templates such as Progressive Profiling which should be able to reach your desired outcome.