# Connect via Cellular ## 4G Connection To use 4G in the field, it is recommended to connect your laptop to a dedicated mobile hotspot. The rover requires an external USB cellular modem, preferably a compatible 4G USB modem. A GSM compatible modem is ideal. The rover will automatically connect to the remote server upon establishing a connection to the internet. It is important to use the [Wi-Fi terminator](/hardware-and-interfaces/hardware/components-overview/miscellaneous/sma-wi-fi-terminator.md) which attaches to the Wi-Fi antenna port and protects the interface when the Wi-Fi is not in use. ### Phoenix LiDAR Systems Connection Service The Phoenix LiDAR Systems Connection Service allows for communication between Spatial Explorer and rover via a remote online server. An internet connection is required on both the computer running Spatial Explorer and rover for this to function. Communication is established through an alphanumeric License Key that is uniquely assigned to each rover. If you are connecting to the rover over a 4G cellular connection, choose the Phoenix LiDAR Systems connection service option when opening Spatial Explorer and enter the corresponding License Key of your system. The correct License Key must be entered for the server to correctly associate the current session of Spatial Explorer and rover. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.phoenixlidar.com/hardware-and-interfaces/connecting-and-interfacing-with-phoenix-lidar-systems/iface_se/connect-to-rover/connect-to-rover-via-connection-service/connect-via-cellular.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.