Vividwireless delivers home broadband over the Optus 4G mobile network, and it shares this mobile network with all of Optus’ mobile customers.  However customers using Vividwireless’ service tend to use more data than a mobile customer, so we have to make sure that there is enough network capacity in the area where you want to use it.  Our network capacity is not the same in all places, so in order to not impact on the experience of Optus’ mobile customers, we only allow Vividwireless’ unlimited data plan in certain areas.