So this might be a me thing only again...
But looks like there has been some form of update pushed?
Mobile in the CBD of chc now has VoLTE indicator on the top bar, and 'home' on my browser suddenly fires off to vodafone.co.nz
Guessing there has been some form of OTA carrier update in the background. Or a switched flicked in the CBD. Both on a Huawei and Samsung Xcover in the office.