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You can select if the USB modem application (Vodafone Mobile Broadband) should start up automatically.
Find "Start & Quit"
Click Vodafone Mobile Broadband.
Click Start & Quit.
Select setting for automatic start-up when the computer is turned on
Highlight one of the following settings below When Mac OS X starts up:
Start this application
Start this application in the background
Do not start this application
Turn automatic start-up when connecting USB modem to computer on or off
Click Start this application when a mobile device is plugged in or switched on to turn the function on or off.
Click OK to close the window.