I have the Sprint Mobile Broadband PMCIA Card from Pantech. I was told by a Sprint Representative that since this card has a phone number and is data I can use it for VOIP. He would not say how since they do not explicitly provide the service. I would like to know how I could use this card to make and receive calls. I have attempted to search for myself and have found nothing substantial other than vague references to the ability to do this and lots of reviews on it.