I'm travelling through Waikato around Whangamata / Thames. Try to make a voice call:

"We are sorry. Your call did not go through. Please try again later".

Same for an hour approx. Data is good tho! : ).

I'm not really here to complain just enquiring.

I assume it is a kind of overload or capacity problem but my recollection is a different message for that. So maybe a generic failure message.

Anyway, feel free to advise ; ).