Gobi makes a card that works with sprint and its internal. I just needed to make sure it works in that Dell
http://www.dell.com/content/topics/global.aspx/sitelets/solutions/mobility/wireless_broadband?c=us&cs=04&l=en&s=bsdWindows 7 compatable
Manufacturer Part# DKYD6
Dell Part# 313-9362
Not windows 7 compatable
Manufacturer Part# J029P
Dell Part# 313-7847