Summer officially begins Friday and Dairy Queen wants to celebrate with a sweet treat.

All day Friday, June 21 the fast food chain is offering free cones to all of it's customers, but it comes with a catch.

The offer is only valid if combined with a purchase.

To get the deal download the free Dairy Queen mobile app. Then you'll get a single-use mobile coupon.

The coupon allows customers to choose from an orange dreamsicle dipped cone, a chocolate-dipped cone or the regular vanilla cone.