I bought the Edge Network card (Sony Ericsson) for my laptop from Cingular for use internationally (where I have fine GPRS service on my Blakcberry from Cingular.)
The card does not work well....it does not work poorly....it absolutely does not work at all. Tried it with every setting I could image in UK, France and Italy. I am returning the card to them. I expect a hassle about the activation costs but this things does not work! Even a little bit.