Hmm.. I have a Sidekick II right now with the unlimited data plan, and I was thinking about along with this, getting a PCMCIA card for use in my laptop. I asked a rep at T-Mobile if this would work (Just transferring the SIM card when I needed to use my laptop with the PCMCIA card). He said that it wouldn't work because it was a 'different kind of data'. I didn't really think he knew what he was talking about. Can you confirm that this will/won't work? Thanks.