I just tested your solution, but after reboot, the connection 3G is not visible in NetworkManager.
aliokan@aliokan-laptop:~$ lsusb
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 004: ID 0c45:62c0 Microdia Pavilion Webcam
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 005 Device 002: ID 0b05:b700 ASUSTek Computer, Inc.
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 003: ID 0af0:6971 Option
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
aliokan@aliokan-laptop:~$ sudo vi /boot/grub/menu.lst
I just tested your solution, but after reboot, the connection 3G is not visible in NetworkManager.
aliokan@ aliokan- laptop: ~$ lsusb
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 004: ID 0c45:62c0 Microdia Pavilion Webcam
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 005 Device 002: ID 0b05:b700 ASUSTek Computer, Inc.
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 003: ID 0af0:6971 Option
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
aliokan@ aliokan- laptop: ~$ sudo vi /boot/grub/menu.lst
title Ubuntu 9.04, kernel 2.6.28-11-generic e6a0-4b50- 86c7-668a11e405 3f 2.6.28- 11-generic root=UUID= 4acafa8e- 9e21-4cb8- acc7-1c49dabdc7 b0 ro quiet splash usbserial. vendor= 0x0af0 usbserial. product= 0x6971 img-2.6. 28-11-generic
uuid 53357e50-
kernel /vmlinuz-
initrd /initrd.
quiet