Sprint doesn't have a gateway in Walnut Creek, CA. Virgin Mobile does. Similar concept to how DataJack's TMo gateway is in Rackspace at Dallas...same as any other white-label TMo 3G provider.
Haven't you heard, Datajack uses Sprint now -- 2010 Ford Fusion Sport
Yea I did too. But they once again have changed their mind. They told me in an E-Mail they are now using Sprint infrastructure, and it look's that way because their coverage map matches Sprint's native EVDO network. -- 2010 Ford Fusion Sport
So now DataJack offers nothing special over anyone else...hmph...
Nope, it's more expensive than unlimited Virgin Mobile and neither can roam so might as well get the unlimited Virgin for $40 instead of the $50 for 5GB datajack on Sprint. -- 2010 Ford Fusion Sport