Ready for a smartphone (chose Droid X). Please explain difference between a MiFi and express card. I know you will find this funny, however this past summer I found myself in quite the perdicament. I work from home (not the problem) however while the kids were home during the summer we spent a lot of time at the neighborhood pool . . . however there is NO wifi available so I couldn't work while they played. There's only so many different moves off the diving board that I can fake liking. I'm ready to buy the X tomorrow, but I don't know whether to buy MiFi or express card???? Secondly . . . once the MiFi - express card is settled, do I need 150mb or unlimited? Thanks so much!