Perhaps I'm wrong but after many long phone calls/waits to check it appears that Spark customers enjoying Sparks wireless broadband via the 4g network have no way to access devices in their lan.

It seems that the limitations of CGNAT prevent inbound traffic.

Can anyone help me out here and confirm this is so?

Is this only Sparks network or does it include other providers as well (Vodafone/2degrees...)?

Can anyone also help with anyway to allow access to devices at a residence. Examples may include security systems, aircon units etc etc...

I'm thinking a vpn to an onsite pc and then out to the local devices...

Look forward to a reply,