Phantom Alert is primarily designed to function using both GPS and data connections to provide real-time alerts and updates about speed traps, red light cameras, and other potential driving hazards. However, certain features may still be accessible even when offline, as the device or application may retain previously downloaded data. For users who are relying heavily on real-time updates, an active internet connection is generally required. It is important to note that the effectiveness of the alerts can vary based on the availability of up-to-date data. If you are looking for specific functionalities or how offline capabilities work in detail, checking the official website or the application's information section would be a valuable resource.