How to see what data field was updated last

how can i see which specific data field was updated last in a lead/contact?

for example, the phone number was changed. where can i navigate to to see who updated the which data field and when?

There is an option on Studio to enable the Audit option on the different fields.

To enable/disable that option, go to Admin > Studio > Your_Module > Fields
From there click on the field and mark Audit checkbox.

That should keep a track o changes on said field.