Woodland Hills-based United Online has expanded the firm's NetZero Digital Subscriber Line (DSL) broadband service, the firm said Monday evening. United Online said that its DSL service is now available in major metropolitan areas served by Covad Communications Group. NetZero's DSL service is targeted at its customer currently using dial-up service, and allows access to DSL ranging from $19.95 to $34.95 per month, depending on location, with download speeds ranging from 768kbps to 3.0Mbps.