Add to /etc/modules or create /etc/modules-load.d/zte.conf :
: Most modern kernels (Ubuntu 20.04+) support this chipset out of the box via usb-modeswitch . If it shows up only as storage, run sudo usb_modeswitch -v 19d2 -p 0199 (check your specific PID first using 3. Accessing the Web Interface zte mf833t driver top