A telco customer has died after their phone could not make calls to the emergency line on Australia's third-largest mobile network.

TPG, which also operates the Vodafone and Lebara brands in Australia, revealed a person had died on Thursday when their Samsung phone could not make triple zero calls.

"This is a tragic incident, and our condolences and thoughts are with the individual's family and loved ones," TPG Telecom CEO Inaki Berroeta said.

"Customer safety remains our highest priority.

"Access to emergency services is critical."

At the time the Sydney-based caller attempted to reach the emergency hotline through Lebara, there were no outages and the telco's network was operational.

But early investigations indicated that the calls failed because the customer's ageing Samsung phon

See Full Page