Etisalat also operates iZone, a system of Wi-Fi hotspots in central locations, such as shopping malls, restaurants, and sheesha cafes. iZone can be accessed by either purchasing prepaid cards, or if using an existing account. Dial-up and ISDN Internet access services are billed by the hour, whereas the domestic and residential cable and DSL connections have a fixed monthly rate depending on speed. Other Internet links, aimed at business users, have traffic utilization plans and relatively high rates when exceeding the allocated bandwidth quota. This has caused bad publicity for Etisalat and is a major source of criticism.