>In QMI mode, the LTE interface is directly connected to your system, the 10.... IP you got is the one assigned by your carrier (I am not sure where the initial

>In QMI mode, the LTE interface is directly connected to your system, the 10.... IP you got is the one assigned by your carrier (I am not sure where the initial 169.254.231.106 IP it had before you established the connection came from) and your machine is directly reachable from the Internet. Maybe from the OS on the Raspberry Pi. I don't think it comes from the modem. Generelly I would recommend using MBIM if possible. Some Huawei devices also had NCM, which is even better in terms of handling. You only have to send a command on the serial port to connect, then use a DHCP client on the ethernet interface and you'll get the external IP on that. Also bridge mode is way easier that way.