Just got this DCS-8010LH.  Accessing the camera works perfectly thru the Dlink app.... as long as I am on wifi.  Any wifi, not just at home.
But if I have to access it thru cellular data, it just says "loading" and never stops. 
Firmware version is 1.00.04.  My phone is an iPhone 8+ on the latest IOS, using Cricket as the provider.  My router is an Asus RT-AX66U.