What happened

TPG's planned decommissioning of a legacy 4G packet core caused all 4G signalling links carrying live traffic to fail. Most customers could not make or receive voice or Wi-Fi calls. Of 147 attempted emergency calls, 104 reached Optus or Telstra through camp-on and 43 did not connect. ACMA found that TPG also failed to notify the emergency-call operator promptly. No adverse outcome was identified in the published welfare-check account.

When cited sources give different casualty, damage or spill figures for this event, they’re reported side by side above rather than merged into one number. See how confidence levels work.