Access mobile router exteally. Public/Private IPs?

Ive got a mobile router running of a mobile SIM which I would like to access exteally through DDNS. The public IP is 49.x.x.x however within the router (Comset CM685 Mobile Router) it says that the WAN IP is 100.x.x.x. I believe this may be because of the the Carrier-Grade NAT.

Firstly, should the WAN IP ideally be the same as the Public IP?

Secondly, Is there any way i can access this router remotely? If i try to ping any of the IPs it simply times out. DDNS points to the public IP but it seems to lead nowhere.

Any advice would be highly recommended. Thank you all.

Recent Questions...