Australia's Biggest Telco has nationwide outage
abc.net.auApparently an issue with NTP across thousands of nodes.
I wondered if "time synchronisation" was NTP backed, but actually relates to timing information in the mobile layer (2 down) not the IP stack (3 up)
Can I ask where you got this info from? I haven't seen any info as to the cause so far, although that's not unusual I suppose.
Also affected MVNO using the provider.