Vodafone has had to delay the roll-out of Android 4.1 Jelly Bean to the Nexus S after finding a software fault.
Customers had been expecting Jelly Bean to roll out to the Nexus S today.
In a short blog post on the Vodafone Australia website, Vodafone announced it had found that the software "does not meet all the Australian regulatory requirements related to emergency calls".
Vodafone said that there is no longer any expected timing for the roll-out to resume.