For the second time in less then a month, many Telstra customers have been unable to make calls or access data.
Prepaid mobile customers were left without phone or data services early on Wednesday morning before Telstra managed to restore data by 9am AEDT and calls an hour later.
"Some of our prepaid mobile voice and broadband customers may have experienced issues making calls, recharging their credit, and accessing the internet this morning," a Telstra spokesperson said.
It is unclear how many prepaid customers were affected by the outage and some may still have problems making overseas calls, he said.
Last month, Telstra suffered a national outage on its 2G, 3G, 4G, National Broadband Network, ADSL, and PSTN networks across the country, due to what it dubbed an 'embarrassing human error'.
The human error occurred when the correct procedure was not followed after one of the telco's 10 mobile nodes was taken down.
"The outage was caused when one of our major mobile nodes went down," a Telstra spokesperson said at the time.
"The network is configured to manage this; however, in this instance, we had issues transferring customers to other nodes, which caused congestion on the network for some customers."
As a result of its February outage, Telstra offered a free data day to its customers on the following Sunday.
Telstra later said that its customers had downloaded 1,841 terabytes of data on that Sunday, which represented a doubling of its regular Sunday traffic.
"As we anticipated, the high demand meant some customers had slower than normal data speeds on 4G services, but overall the network performed as designed," Telstra Group Managing Director of Networks Mike Wright said in a blog post at the time.
Yesterday the company announced that its mobile and fixed broadband customers would be able to receive a free two-year 200GB Microsoft OneDrive storage subscription.
Telstra customers wanting to take advantage of the offer can redeem their subscription offer through their account on the Telstra website or the 24x7 app.