Whataburger fans! You may be able to score a Free Southern Bacon Double Burger with the new offer available in the Whataburger app for select Rewards members. The best part, no purchase is necessary! If you are new to Whataburger Rewards, you will not be eligible for this deal but you will get a free Whataburger when you sign up. Go here to download the app and sign up if you're not a member yet. Then, check the Rewards section under Offers to see if you have this freebie. Expires 9/25.