BOGO Med/Large Dunkin Donuts Lattes after 2pm w/ mobile application (some location restrictions) + other deals
Download the Dunkin Donuts app with Dunkin rewards card and get a free medium/large latte with the purchase of a medium/large latte. Must be after 2pm. The regional restrictions are very specific to certain cities and are too numerous to list; all disallowed cities are in the Midwest or South with the exception of NYC. Coupon must be scanned via mobile phone and cannot be printed.
Other promotions currently going on:
6 free doughnuts with Box O' Joe purchase
2 doughnuts for 99 cents
$1 off when you buy a bakery sandwich and medium beverage