HURRY! Get a FREE Drink at Dunkin' when you add the code 123LETSGO in the Dunkin app, for a limited time! Open the app, tap on Offers, then scroll down to ADD A PROMO CODE and enter the code above. Your Free Iced Coffee Reward will be added and valid until 10/21/23 on a small, medium or large coffee. Not valid on Cold Brew or Nitro Cold Brew.