I have found the following.
When I plugin the PCMCIA card the driver configures 4 devices, ttyUSB0-3 ,
networkmanager (or modemmanager?) is randomly selecting a device when
connecting.
The connection is only successful when the ttyUSB0 device is used.
** Also affects: modemmanager
Importance: Undecided
Status: New
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Vodafone 3G PCMCIA Card ramdonly fails to connect
https://bugs.launchpad.net/bugs/434275
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