A global search is on for the next Optus chief executive after Kelly Bayer Rosmarin resigned amid a federal government review into the telecom's nationwide outage.
A Senate inquiry into a 12-hour Optus outage that affected millions of Australians has revealed hundreds of triple-zero calls were unable to go through.
TPG and Telstra will appeal after the Australian Competition and Consumer Commission declined to approve their proposed $1.8 billion network-sharing deal.
