Telstra is working rapidly to bring its mobile network back online, after hundreds of thousands of customers were caught up in a nationwide outage.

Telstra customers, as well as customers of mobile providers that use Telstra's network, have flooded outage detection websites with reports.

The widespread outage is affecting mobile calls and data connections, and has even prevented some businesses from processing payments.

Tech expert Trevor Long discusses Telstra's major network outage affecting customers this morning.

Mobile and internet services are affected as the telco says it is "looking into" the problem.

Carrier restoring mobile services after network used by millions goes down for many users, shutting down regional trains and affecting emergency calls

Telstra is working rapidly to bring its mobile network back online, after hundreds of thousands of customers were caught up in a nationwide outage.

Telstra is investigating what caused a national outage that stopped trains, transactions and some Triple Zero calls.

Telstra remains under fire after callers were again unable to contact Triple Zero once again.