Whataburger is celebrating National French Fry Day by offering a FREE Fries to Whataburger App users on July 12th. If you’re a first-time member, download the app and use the code NVKHB8RN83FJ to be rewarded with one free order of medium fries and one free Whataburger (plus 500 points when you make your first online order over $10). Existing app members will see the offer on their account on July 12. The offer can be redeemed in-store, drive-thru or curbside.