Dell Inspirion netbook

I am trying to connect to my internet by going to the cellular south 3G icon and clicking connect which I've done several times since November 26, 2009.  Tonight, I got a Radio Off message and could not connect.  I've been on the phone with tech support for 2 hours(NO Help!!!).  This is very frustrating and not to menion that this piece of equipment was #1 on my child's Christmas list.  Please help??