The failed switch was based at Tullamarine, Melbourne and the break down was caused by the hot weather.
Vodaonfe's spokeswoman Karina Keisler said that the failure was affecting around half of its Victoria customers and up to 15 percent of Vodafone customers nationally.
"My understanding is that the airconditioning has failed which has created an overheating in the switch and a failure as a result," she said. "I believe it was caused by today's extreme temperatures."
The failure appeared to primarily affect inbound calls with outbound calls unaffected, and started at around 7:45pm local time with some services restored about four hours later.
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