Optus admitted up to 600 households in SA, WA and the NT were impacted by the triple-zero outage. Photo: Dean Lewins/AAP PHOTOS

Triple-zero calls were out of action for eight hours longer than Optus initially claimed after a "bewildering" response to a botched network upgrade during which three people died, authorities have revealed.

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Optus has admitted to the SA government calls were out of action for 10 hours on Thursday and SA police worked through Friday night conducting welfare checks on 150 people whose triple-zero calls failed, SA Premier Peter Malinauskas said on Saturday.

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