An article advocates for the use of a 'duress PIN' on smartphones as a security measure to protect sensitive data. A duress PIN unlocks the phone but triggers a pre-set action, such as deleting specific files or alerting a designated contact. The author argues that this provides an extra layer of security in situations where the user is forced to unlock their device, safeguarding their private information even under duress. They explain the technical implementation and encourage widespread adoption of this security practice.