Charles is concerned that users of Android devices in his company are delaying OTA updates. Why would Charles be concerned about this, and what should he do about it?

OTA (Over-the-air) updates are leveraged by cellular carriers and phone manufacturers to provide firmware updates and updated phone configuration data. Mobile device management (MDM) tools can be employed to monitor the current firmware version and phone settings, enabling Charles to determine whether his staff's phones are updated, and therefore, secure. While a network access control (NAC) agent may capture some of this data, it is limited to network-connected phones and will not cover off-site phones, those with Wi-Fi turned off, or remote devices. It's important to note that OTA is not specifically intended for updating encryption keys, although firmware or settings may include them. Lastly, it's worth noting that OTA updates are not initiated by the phones themselves.