You have a Lead.csv file with a lot of numbers.... and a LOT of rows.
But you have to answer some questions. Let me show you how to use a few commands to parse your data, then interpret it to be useful.
I exported my leads with the Status of SALE. I want to see which Area Codes the majority of my sales came from.
Part 1- Break out the Area Codes from a full phone number using LEFT or RIGHT functions
Part 2- Use a Pivot Table to display the data so you can see the counts per Area Code