Optus protects customers from 'bill shock' OPTUS is betting the revival of its mobiles business on a bold play to eliminate "bill shock" from customer mobile plans, saying exorbitant phone bills are about to become much more common as people move to fast 4G services. The warning from Optus boss Kevin Russell came as the telco reported its fifth quarterly decline in revenues, which slid 5.3 per cent to $2.12 billion as its main mobiles business shed 6.1 per cent in revenue to $1.34bn.