I'm giving you two links to download the drivers for Huawei fwt wireless mode1- http://www.openpages.info/huawei.html
You will probably need to edit the wvdial.conf file a little so that you are using the right connection parameters for your internet service.
If those URL's did not help, please follow this procedure:
Step 1: Open Terminal from "Applications->Accessories->
Step 2: Run the following commands (copy-paste each line below to the Terminal then hit <enter> after each line)
sudo lshw -C network
dmesg | grep USB
Step 3: Post results (cut/paste terminal output from each command) here
Step 4: Provide us with the full model and make of Huawei modem.
What is the exact model number? Does it connect to the PC using a