Optus to cut cost of 1GB excess data from $250 to $10 over 'bill shock' Pretty dramatic change ... Optus MD of Customer Vicki Brady. Picture: John Fotiadis Source: News Limited OPTUS will cut the cost of using an extra gigabyte of mobile data from $250 to $10 as it seeks to end "bill shock." "It's a pretty dramatic change," Optus MD of Customer Vicki Brady said. More than one million of its customers have been hit with big, unexpected charges in the past 12 months for going over limits. Bill shock hits mobile phone users "We know that's not acceptable," Ms Brady said. New customers - and existing customers who switch to a new range of plans - will no longer pay $25 per megabyte of excess usage. Instead they will be charged an additional $10 for 1GB (1000MB) of additional data. Research conducted for Optus found 80 per cent of users felt $10 for another 1GB was "fair and reasonable." Its new My Plan range, available next month, will also say what the included call allowance is in terms of minutes, not dollars - the current, confusing industry practice.