Terms and Conditions: Optus 3G dual band service is part of the Optus Open Network™ and refers to our UMTS2100MHz/900MHz coverage. Coverage available throughout the Open Network in 3G dual band areas subject to network availability. You will require an Optus 3G dual band compatible device to access the 3G dual band coverage, throughout the Optus Open Network™. A number of factors may affect coverage including location, demand on the network and use of external antenna. When within a 3G dual band coverage area, your call or data session may also access the GSM/GPRS network if your handset supports GSM/GPRS 900MHz Click here for full coverage information.