It appears that you are assigned with a private IP address from your ISP and you are under at least one layer of NAT in provider's network.
Just to make sure, you could you login to the router's WebUI, navigate to Network -> Interfaces -> General and check the IP assigned to mob1s1a1 interface?
If you are indeed given a private IP, you will need to contact you ISP. Some providers require to use certain APN values to provide you with a public IP, but you will need to enquire about that.
Otherwise, you could consider using a VPN solution, which does not require a public IP. One such option could be ZeroTier. You can refer to this page for configuration example.