The AIO-6 LTE is designed with built-in 4G connectivity. However, if you do not insert a SIM card, or if your SIM card has no available data, the device will simply lose its 4G-related functions.
What Features Are Affected
No 4G data connection (e.g., Parking Guard & Instant Alerts, Remote Wake-Up & Live Streaming, Real-time Tracking, Geofencing Security, Weather Updates).
What Features Still Work Normally
All other core functions remain unaffected and work exactly the same as on the AIO-6 Max:
CarPlay
Android Auto
Dashcam recording
BSD function
Local Wi-Fi transfers (device hotspot) for nearby downloads (no internet)