Thanks for the reply!
Good for Enterprise can be installed on both android based phone (with wifi and 3G) and tablet (with only wifi). When it is installed on phone, it requires the mobile network to turn on. It does not require so when it is installed on a tablet.
Although eDGe does not have mobile network ability, it still “tricked” Good for Enterprise to believe it does. It is likely that the customized Android for eDGe contains some software/components that do this trick. If this is the case, I would like to know what are these software so that I can delete them and hopefully that will help Good for Enterprise to realize that eDGe is instead a tablet, not a phone.