Comment 2 for bug 427325

Please log this as a bug against modemmanager:

On latest Koala, 2.6.31-15-generic #50-Ubuntu SMP Tue Nov 10 14:53:52 UTC 2009 x86_64 GNU/Linux

can get this modem to work, as follows:

add the following rule to /lib/udev/rules.d/77-mm-zte-port-types.rules:
ATTRS{idProduct}=="2000", ENV{.MM_USBIFNUM}=="03", ENV{ID_MM_ZTE_PORT_TYPE_MODEM}="1"
ATTRS{idProduct}=="2000", ENV{.MM_USBIFNUM}=="01", ENV{ID_MM_ZTE_PORT_TYPE_AUX}="1"

then change the connection setting in network-manager: right click nm applet -> "Edit Connections..." -> Mobile Broadband -> This Connection -> Edit -> ipv4 Settings:
Change the default setting of "automatic (ppp) Addresses Only" to "automatic (ppp)"

Still need to eject the modem on insertion, but from there everything works automatically.