In short:

Telstra's mobile network has suffered a major nationwide outage, affecting millions of customers and causing delays to public transport networks.

Some regional train services in NSW and Victoria have been suspended, and taxi passengers are reporting they are unable to complete payments.

What's next?

Telstra says it is looking into the issue and will share an update once it is fixed.

... police in Western Australia have posted a statement on Facebook saying the outage appears to have affected some Triple Zero calls ...