Three people have died in Australia following a technical failure at Optus, the country's second-largest telecommunications provider, which disrupted vital emergency call services.

An eight-week-old boy and a 68-year-old woman were among the three people who died after some customers were unable to make triple-zero calls, following an outage during a network in Optus services on...

The telco could face fines of more than $10 million and other legal penalties.