I have an elementary question. If you buy the card from other vendor (such as this one posted on this thread), how would you active the card with the telecom service providers such as T-Mobile, Cingular, and etc? I thought there is some type of activation process. The cards those telecom companies offer as their OEM are tuned toward Windows OS. I am interested in getting one of those cards for my Mac. I have Sprint card for my work PC so that I can get connected while on the road at all times.