Remote viewing over hotspot

Currently, I can not get regular Internet service where I live. I do have an unlimited 4G hotspot through Sprint. Get very good speeds with it.

All ports show up as "stealth" when I do a scan. I have tried forwarding them correctly 80 and 37777 and also tried changing them to non-traditional ports, with no success.

Is there anyway to make this work using a dedicated NVR?

Is your NVR pointing to the 3G router as a a gateway?

Yes, it is pointed at my cradlepoint router as the gateway

Sorry. In that case, I cannot offer further help without remote access to the router and camera.

Another possibility is that some ISP block such ports.

I think it is Sprint blocking ports....when i do a port scan on my ddns it only shows port 80 and 21 (sometimes) open. I have forwarded both ports to my NVR and even tried putting the NVR in the DMZ