You could use no-ip.com and forward a port on your router.
On your phone you would put the web address created at no-ip.com and port from router.
In my Milestone Argus (WD NAS Server App), I have no-ip.com as madeupname.sytes.net:6000(not my real address or port). But my Argus software is user name and password protected by the NAS so you can't just access it through the web.
If you forward your port, you open yourself to some real danger.
no-ip is free, but you have to have a router that supports dynamic-DNS, or a PC that is up and running 24/7 to run the dynamic-DNS software. Also, you have to verify your free membership every month. The cool feature is that even if your service provider gives you a dynamic IP, no-ip makes it 1 accessible address.
To test if no-ip will work for you, forward a port to your camera, go to google.com and type, what is my IP. you will then get something like 255.255.255.255, enter that in your app settings with the port number 255.255.255.255:6000.
without being on your WI-FI, test your connection.
Most residential internet providers only give dynamic IPs that change frequently, tomorrows address could be 254.254.254.254, that's where no-ip comes in, it turns your home's changing IP to a static internet address "hackme.sytes.net". you would then put that into your app settings, hackme.sytes.net:6000 to access your network. even if your home IP changes, no-ip will automatically update your address.