I've recently changed to Vodafone Wireless Broadband. We are in a rural off-grid environment.

When looking into prior to signing this I was told 'NO Fixed IP. However, I noted the NZ Vodafone B3000 router-modem manual showed port-forwarding and had an inbuilt link to DynDNS.  I needed this to allow off site access to a security camera. I thought, great, I'll be OK without fixed IP, I'll just use DynDNS ore similar. 

Sadly since signing up with vodafone there is a real problem achieving this. I had managed to do this via our previous ISP which allocated a fixed IP. Maybe I should have checked the fine print but even in the Service agreement it does not make a note of this being an issue. In Geek Forums there is mention of vodafone using 'CGNAT' but these threads are over year so so old ? still apply.

Can anyone comment and if possible walk me through how to achieve this? I did note that there were comments about using the right APN, but this is 'auto' in router and therefore not able to be altered.