.The mobile provider don't provide public IP address ...
.... so you can not use functionality of public address, remote access to router, port forwarding etc..
I specially applied the static public IP on LTE, I confirm it works. But l need a USB modem for my application.The mobile provider don't provide public IP address, so you can not use functionality of public address, remote access to router, port forwarding etc..
Many many services doesnt reliable with VPN. e.g. UDP based streaming without MTU configable.You can still set up a VPN to route your public IP.