Which of the following is NOT a method mentioned for securing CJI data on cellular devices?

Keeping devices unlocked for convenience is not a method to secure Criminal Justice Information (CJI) data on cellular devices. In fact, this practice compromises security, as it allows unauthorized access to sensitive information. Properly securing CJI data involves ensuring that devices are locked when not in use, employing strong passwords, and utilizing advanced authentication methods.

Methods like employing personal firewalls are crucial because they help monitor traffic and prevent unauthorized access. Using antivirus software protects devices from malware that could potentially access or compromise CJI data. Furthermore, utilizing advanced authentication adds an additional layer of security, ensuring that only authorized personnel can access the information.

In contrast, keeping devices conveniently unlocked undermines all these security measures and creates vulnerabilities, making it the clear choice as a method that does not secure CJI data.