This may help some people: Here is how I got a new mobile broadband connection to work with Huawei E173. It replaces my older Huawei E230 which had no separate antenna. Don't forget to put your SIM card into the new modem. The Huawei E173 so far seems much faster probably due to the antenna. More details you find here.
1. Download the Huawei E173 driver for linux. I found it here.
2. Unzip the linux.zip file in a convenient location, for instance on the desktop. Upon decompressing you'll have a new folder: ~/Desktop/Linux/
3. Right click on each individual file in the folder ~/Desktop/Linux/, chose >> Proprieties >> Permissions - read and write all + check on "Allow executing as a program"
4. Open a terminal window (CTRL+ALT+t) and write in command line:
and press Enter on all questions.
The Huawei E173 driver will install (the default installation path is in /usr/local/) together with a specific connection program called Moviestar 3.5G/Mobile Partner
You can change the language from Spanish to English in the options.
I installed in on Ubuntu 10.04, Lucid Lynx (LTS) 64 bits.