How to connect the linked data with a number field and show subsequent fields based on condition?

I am creating Airtable form where my first field is mobile no.
What I want to do is if mobile no. already exists in my excel/google sheets/airtable database , then a different set of fields needs to be displayed and in case the mobile no. does not exist in my database another set of fields nformeed to be displayed.

How do I go about this in the Forms?

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