Join the Wayback Burger Text Club to get your coupon valid for FREE 16oz Milkshake ($5.49 value). Just text WAYBACK to 833-990-0950 to join. This offer is available for first-time subscribers only. You can choose from classic flavors like chocolate, vanilla, or strawberry. Also, there are some fun concoctions like Oreo Mud Pie, Strawberry Banana, and more.
The coupon is valid for 30 days after joining text club. Spread the word!