/data/ispsetup.cfg is a configuration file for network settings, mail, and other information. It is important and should not be deleted even for broadband USB Ethernet users.
Content[]
ISPName=Broadband connectionType=USB Ethernet user= password= securityWord= setupUser= setupPassword= setupNumber= accessNumber= userNumber= numberPrefix= numberLocal= 10DigitDial= setupURL= DNSPrimary= DNSSecondary= staticIP= netmask= gateway= hostname= Mailuser= MailDomain= POP3Server= POP3User= POP3Password= SMTPServer= SMTPUser= SMTPPassword= SecondaryId= SessionId= PricePlan= billingFirstName= billingLastName= billingMiddleInitial= billingAddress= billingCity= billingState= billingZip= billingCardHolder= billingCardNumber= billingExpiration= billingCardType= publishName=