^ port binding here means that a particular broadband account'suser name and password work only on the concerned phone line . i.e. phone number is verified when we try connecting to broadband .if a broadband connection is port binded then we cannot use itthru some other's broadband enabled telephone line . initially all unlimited dataone accounts are port binded . and home 500 plan accounts at many places are also port binded . whatever is the plan , we can also request to port bind our broadband accountso that others cannot use our broadband account ...