Diagnosis
The new SIM isn't provisioned correctly on Arlo's cellular network, or the camera hasn't properly registered with the new ICCID.
How to Fix It
Force a network re-registration.
- In the Arlo app, go to the camera's Device Settings > Mobile Service > Manage Service.
- Select 'Change SIM' and follow the prompts to enter the new SIM's ICCID number (found on the card).
- Save, then power cycle the camera completely (remove battery for 30 seconds). Wait up to 15 minutes for full registration.
If That Didn't Work
The APN (Access Point Name) settings may be wrong. In the same 'Mobile Service' menu, ensure the APN is set to the one provided by Arlo for your region (often 'arlo').
Heads Up
Arlo's cellular service is not compatible with standard consumer SIM cards from carriers like Verizon or AT&T; you must use an Arlo-provisioned SIM or plan.