Most directories of cell phone numbers require users to pay a fee; however, the National Cellular Directory is a database of cell phone numbers that occasionally allows users to search for free. Free searches are only available during designated daily happy hours hosted by the directory.
To take advantage of happy hour, users must create a free account with the National Cellular Directory. The promotion takes place once a day, usually during off-peak hours. Though it does not happen at the same time every day, users can follow the National Cellular Directory on social media to find out when the next happy hour takes place.