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1. Have loaded option kernel module:

# modprobe option

1. Search for Vendor ID and Product ID of the USB modem (device should be plugged in):

$ lsusb

Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 004: ID 5986:0299 Acer, Inc 
Bus 001 Device 003: ID 0a5c:21f4 Broadcom Corp. 
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 004: ID 22de:6801  
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

So our device is 22de:6801 (VendorID: 22de, ProductID: 6801), WeTelecom WM-D200, CDMA 450 EVDO Rev.A.

1. Put device id to the file echo "22de 6801" | sudo tee /sys/bus/usb-serial/drivers/option1/new_id

Now device should be detected and available in device manager.

1. Set option module to load on system start:

Add option to the end of /etc/modules