• Insert sim in the stick (a metal tray slides out at the usb connection)
• plug the modem into the USB port.
• The software should autostart and you will be prompted which language you wish to install. It takes a few mins to install (takes a long time when I tried it in Vista).
• Once installed you will find the connection manager running.
• Once it is running correctly you sholud have a signal bar of the network on the bottom left of the connection manager.
• Before you connect you need to create a profile with the network settings of your network provider.
• The settings for t-mobile UK are:
• username- user
• password – pass
• APN – general.t-mobile.uk
  

• The settings for Three are:
• APN- three.co.uk
• Once you have entered the settings for the profile you have created you need to save it.
• Then make sure that profile is selected and press the connect button.
• You should now have internet access and usually you are greeted by the networks homepage telling how much it costs to browse.

• Sometimes other mobile connect managers installed on the computer can interfere with this software so it is best to uninstall previous installations (In Microsoft XP,Control panel, add/remove programmes).
• If you get a network signal but are unable to connect recheck and check again your networks settings (APN, password etc).
• Have you got good network recepetion?
• Make sure your sim is enabled for data calls (check with your network provider).
• Still having problems try a google search for this type of card, your computer OS and perhaps your network.  If still no luck contact me with the above info and we will try and sort it out.

£5 a month click this thread.