Comment 11 for bug 369311

Guys, I have a solution. Works for me.
Using ZTE MF 637
Ubuntu 9.10

1. Add a Mobile Broadband network in Network Manager, configure the number, APN and PIN. In some cases username and password are required.
2. Give it a name you'd recognize.
3. IPv4 settings method should be "Automatic (PPP) addresses only.
4. Add DNS servers (Google's are 8.8.8.8 and 8.8.4.4) and apply

5. sudo aptitude install udev-extras (credit: volaer)
6. sudo update-usbids.sh (credit: Sergiu Bivol)
7. lsusb should show: 19d2:0031 ONDA Communication S.p.A. ZTE MF636
8. Plug in the mdoem to a usb port and wait for the modem icon on the desktop
9. right click and eject the drive and unplug it
10. replug the drive. The 4GB drive should appear.
11. Wait one minute. Broadband network should appear
12. try opening https://72.14.221.99 (google.com)
13. If the DNS in the broadband network config is OK, you will be able to use normal urls.

Enjoy.
Guill