which basically means its not sure what network the SIM is on , for example my sim card was coming up with the Access Point Name as 3Telstra
this can be an issue especially when carriers share network lines and some people have said it has messed around with their billing a bit. If you are connecting via a basic windows system you can change your apn settings under
To change mobile broadband connection profile properties (APN, access string, user name, password, and autoconnect settings)
Open Connect to a Network by clicking the network icon ( or ) in the notification area.
Right-click your mobile broadband network, click Properties, and then click the Profile tab.