And for you ZTE owners, I haven't forgotten about you.

Here is a port of usb_modeswitch.
http://www.mediafire.com/?dhzegdkasns
The deb was hastily made, install with dpkg --force-all

And libusb:
http://www.mediafire.com/?lj4awrlcthm

Go to http://www.draisberghof.de/usb_modeswitch/ to set it up. You will need the usbserial module which can be found here:
http://www.internettablettalk.com/fo...ad.php?t=14877

ID's are here. http://blog.ufsoft.org/2007/11/30/zt...em-under-linux

EDIT: Here's a page in Spanish with ZTE info and usb_modeswitch:
http://oasis.dit.upm.es/~jantonio/personal/mf620/

remember to use insmod rather than modprobe and insmod the usbserial module from above, wherever you placed it.

Another page with a different method:
http://hillj.co.uk/2008/01/31/how-to...-linux-ubuntu/