Found a solution, registered here just to post it. Anyone having trouble viewing their cameras on 4G etc.
1. You'll want to use the DDNS option (after following the next steps), and you can go to iPolis app > setup > choose device to find the option to use DDNS.
2. Register your product on Samsung's DDNS site. http://www.samsungipolis.com
Follow on screen instructions, create profile and register your device and give it a custom name. This site will provide you with a DDNS server url, which should be samsungipolis.com/yourdevicename
3. Once registered, go into your Samsung security device's main menu (the actual security DVR, not the app on your phone) and select Network > DDNS and put in the settings you set up on the web site. It should have the following: DDNS Site will be iPolis, server name will be samsungipolis.com, product ID will be whatever you chose.
Once it saves, you should be able to view your cameras over the DDNS server through your mobile device over the data network and not just wi-fi. Also just a tip, on the iPolis app I still just used the username/password I have for my DVR device, not the username/password I set up on the DDNS website.
