Almost all 4G Sim card gets assigned with Private IP. Singtel/M1/Simba/Giga/etc.
For system that required Public IP for further integration, you'll need a Public IP Proxy services.
Lakson provide a solution that can turn your private IP 4G Sim card connection to one that has a Public IP for direct access through Port Forwarding. Contact Us for more details. http://lakson.com.sg/contact-us
