It would seem that perhaps you need to change the IE8 connection settings when you want to switch devices. Take a look at the attachment, under IE8->Tools->Options->Connection Tab->try adjusting to dial whenever a network connection is not present, or try never dial and see if that helps.
Although the Speedtouch 330 is used for ADSL Broadband Internet, it does not appear on the user's computer as a LAN or High-Speed Internet Connection, but rather as a Dial-up connection. Users must therefore initiate a dial-up connection every time they want to connect in order to get onto the Internet.
The Speedtouch 330 is in fact a very basic modem, as opposed to a router modem. It can only grant connectivity to one computer at a...