Vodafone Chief Technology Officer Benoit announced in an online statement (see below):
I want to say sorry to our customers for any network issues you experienced today and let you know exactly what happened. At approximately 11.00am (AEST) services across Western Australia were impacted by a transmission network failure.
As we were restoring services at approximately 1.00pm (AEST), problems occurred which had an impact on our network nationally.
By 4.10pm (AEST) all network services restored nationally except for data services in Western Australia, which were restored at 6.30pm (AEST).
To let our customers know how truly sorry we are, we are offering unlimited data usage within Australia this weekend, from midnight (AEST) Friday 20 June to 3am (AEST) Monday 23 June 2014.
Over the past three years we've completely rebuilt our 3G and 3G+ networks to ensure you have fast reliable mobile coverage. Last year, we launched a lightning-fast 4G network right around Australia. While no network can guarantee it will not experience issues from time to time, we're working to ensure it doesn't happen again.
Again, thanks for your patience today.