I think I read somewhere in the Ubuntu Forums that the same model may already be supported in Ubuntu Karmic, which as of this writing is coming in 6 days.
Anyways, off with the tutorial:
We try to do it the GUI way as much as possible:
Add the repository for the driver:
Open System>>Administrator>>Software Sources
Key in your sudo password as may be necessary.
On the Third-Party Software tab, click Add and paste this two apt line:
deb http://ppa.launchpad.net/liamgh/ppa/ubuntu jaunty main
deb-src http://ppa.launchpad.net/liamgh/ppa/ubuntu jaunty main
Next, download the signing key for the repository and save wherever you want, say the Desktop. Then back to the Software Sources, click on Authentication tab, and click Import Key File, and select the signing key file you've just downloaded.
Install the Drivers
There are two applications that you need to install (zte-mf627-switch and usb-modeswitch). If you want you can do it from the Synaptic Package Manager. Or, just simply issue the following command in the terminal.
sudo aptitude install zte-mf627-switch usb-modeswitchNow We Can Connect
Now if we plug the kit to our system, you should be able to see an icon in the desktop recognizing the usb device. The New Mobile Broadband Connection window would more likely popup. If not, then edit your connections and add the device accordingly.
Follow the settings as prescribed here and you're all set to go!
Credit also goes to Linux Diaries.