The offer for a free hamburger applies to customers with active Whataburger Rewards accounts on the Whataburger App. The Texas-born company also is giving away commemorative table tents in celebration of its 73rd birthday.
Celebrate National Whataburger Day with a Free Whataburger Exclusively on the App gilmermirror.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from gilmermirror.com Daily Mail and Mail on Sunday newspapers.