USB modem: how to enable driver?

[Artur :)]

 Hello! I am going to install FreeBSD on my desktop, currently running
M$ Windows. I have ZTE wireless USB modem, and there is no specific
driver provided for *NIX. But, this device can be used with generic
USB serial port driver. In Linux, device is not recognized
automatically, but can be enabled with command: "sudo modprobe
usbserial vendor=0x19d2 product=0xfffe". Which command can do same
effect in FreeBSD?

P.S. Sorry if my english is too bad :(