@Dear deano
I am using OPENSUSE 12.3 version.
And output of /dev/ttyUSB* is empty! ,But after installation of usb_modeswitch module , USB DEVICE list my 3g usb dongle as you can see in blow picture :
http://s6.uplod.ir:182/d/2k2tqcgk4hvhuf6t4opnf4tl7ljrnwx4h4jh3buigcji4vegtkxx4xrf/Untitled.png
And unfortunately until now i want reply this post ,The Mobile Broadband tab’s strongly disable in NetworkManager settings!
notice: when i am trying to install (usb_modeswitch-data 2.0.1) i am getting some trouble error message and issues that i can’t solve those Because in middle of installation show error message ask for adding repository to continue installation!