4G connectivity issues are the most discussed topic on cellular trail camera forums. Work through this checklist in order:

1.     SIM activation status. Confirm the SIM is active on the carrier account and has an active data plan. Machine-to-machine (M2M) and IoT SIM plans often require specific activation steps beyond consumer SIM setup.

2.     APN settings. The Access Point Name must match your carrier's M2M or IoT network APN — which is frequently different from the consumer APN. Contact your carrier for the correct M2M APN string.

3.     Signal strength at the deployment location. Run a signal test at the exact spot using a smartphone on the same carrier. Fewer than 2 bars of signal will produce unreliable camera connectivity. Consider an external antenna if signal is marginal.

4.     LTE band compatibility. The camera must support the LTE frequency bands your carrier uses in that area. Verify band compatibility in the camera's technical specifications against your carrier's band deployment in that region.

5.     Firmware. Connectivity bugs are frequently addressed in firmware updates. Ensure the camera is running the latest firmware before assuming a hardware fault.