Yeacomm 4G LTE router with T-Mobile unlimited SIM. I found this is not compatible to configure OVPN static IP. Though the iPv4 says connected and when I connect the WAN port to
port forwarding - Portforwarding is not working in E5172 Huawei 4G Router - Super User
How to Setup Huawei E5186 4G router for Network Connection – 4G LTE Mall
port forwarding - Portforwarding is not working in E5172 Huawei 4G Router - Super User