Newbie question: create a new contact

[DanielRozin]

Every time that user go inside to the CRM (From Integromat).

I would like to check if the phone number of the user exists in the Airtable.
If the number is existing, I want that the lead will be updated with the last source of the lead.
If the phone number is not existing, So open a new line.
How can I do it correctly?