A quarter of Optus’ 10.7 million Australian mobile customers have considered leaving the network because of its handling of last month’s Triple Zero outage , which was linked to the deaths of three people after more than 600 emergency calls failed.

The findings show the potential commercial damage to the telecommunications giant from the outage, which followed a critical outage of its entire network in late 2023 and a major hack the year before that left the Singapore-owned company with sluggish growth.

Optus’ handling of the 13-hour Triple Zero outage on September 18 was heavily criticised in the weeks that followed. The telco raised the alarm only after the incident was over, sending alerts to an incorrect email address at the Department of Communications as well as understating th

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