Can't view Floureon Security Camera DVR system remotely..

I recently setup a security camera system (Floureon brand) so I can check up on things remotely while I'm not at home. I've set everything up and connected the DVR to my Netgear Router (DGN2200v4) and can view the cameras whilst connected to my Wifi network.

I've installed about 10 different camera viewers on my Galaxy S5 and entered the DVR systems IP address, but none of them are able to connect when I'm using my phones mobile data. I checked what port the DVR system is using and it's port 80. I've tried opening the port on my router but it won't open, so I tried assigning a different port in the DVR settings and opening those in my router but they won't open either. I tried allowing port 80 through windows firewall but still no good. I've also tried disabling Remote Management in router settings.

The android app that they recommend using for remote viewing with this system doesn't work either (vMEyecloud) so I'm forced to try and set it up through a different app.

I have no idea what to try next, my network skills are limited so I'm at a bit of a loss. Hoping someone can help me out

Hi, have you tried vieweasyv2? This app works well on my dvr.