Always start the Connection Manager first, and then insert the Mobile Card.
Power up and power down the Card by double-clicking on the Connection Manager icon in your system tray and selecting Connect If you don't, the Connection Manager may not recognise the Card.
And you should always power off your Mobile Card before putting your laptop into Sleep, Suspend or Hibernation mode.
To find out more about troubleshooting your Mobile Card, click here.
To find out more about troubleshooting your USB Mobile Card, click here.
To find out more about troubleshooting your Modem, click here.