Optus is under immense pressure from politicians across the nation for the way it has handled an outage that led to three deaths, including an eight-week-old baby.

Last night, Optus's chief executive, Stephen Rue, revealed in a snap press conference that three people died after hundreds of triple-zero calls were unable to be made across South Australia, Western Australia, and the Northern Territory yesterday.

South Australian Premier  Peter Malinauskas blasted the telco CEO last night, claiming that neither he nor the state's emergency services were given any information about the two deaths in the state.

"South Australian police didn't know. No one in SAS or ambulance service knew; my office didn't know. But then they conducted a press conference," said Malinauskas.

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