I've been having exactly the same problem. With ModemManager-0.2.997-5.git20100101 (the build mentioned above), NetworkManager recognizes my ZTE MF636, and I can connect normally, so this bug is fixed to me.
I've been having exactly the same problem. With ModemManager- 0.2.997- 5.git20100101 (the build mentioned above), NetworkManager recognizes my ZTE MF636, and I can connect normally, so this bug is fixed to me.