Before you hit the town, the user sets the app to run from between three and 12 hours. During this time, Drunk Mode will hide your contacts list on your phone so you can't call particular people; block apps on your phone such as Facebook and Snapchat so you can't upload any embarrassing photos; text you with reminders not to call or message a certain person; and use GPS to tell you where your friends are if you are so drunk that you lose them. Lastly, Drunk Mode has a feature called Breadcrumbs, which will show you on a map where you have been and at what time - handy for the morning after.