Dell Aero 3G

My problem is that aero dell gave a master reset as is the guide       http://support.dell.com/support/topics/global.aspx/support/kcs/document?c=us&cs=19&docid=266819&doclang=en&l=en&s=dhs        The problem is that he lost the 3G connection and the computer has configured the apn as it had before and as well connected, some have told me that 3G radio lost my question is how I solve that problem.