There is a fault with the 027 network either nationwide or lower north island (ive had conflicting reports).
Things which are working intermittently or not at all: (that I am aware of)
Prepaid not billing at all (dont count your chickens - you will probably be retrospectivly charged).
Caller tunes
Outgoing calls
Incoming calls going to voicemail
Voicemail notifications
Text delivery
Supposedly will be fixed by 10pm tonight.
Im in Central/East north island - would be interesting to know where you are if you are having problems (or otherwise)