For example, a 2014 article about the now-discontinued app Noknok describes how many women are labeled by insulting names, and one woman found herself on the site listed as “Ness booty call 2.” Most of these apps are smart enough to figure out that “Mom” or “Dad” is not a useful name to display for an incoming unknown number, but will often refer to the literal name given in a contact book, which can be incomplete, derogatory, or mnemonic. With many of these apps, this information comes as the result of vacuuming up the contact books of its users, then cross-referencing the data with other instances of the same number being used as well as with Facebook profiles that list a number. However, the way that these apps gather information to determine the name of an unknown caller is not as broadly advertised. Popular apps such as TrueCaller or GetContact advertise the ability to see who is really calling you, even if you do not know the number, and alert the app user of spam or scam calls.
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