Re your network settings, I would set it to "unknown" so that the phone figures out the best setting for itself.
LTE is NZ style 4G
TD-SCDMA - I don't believe this is used in NZ but could be wrong.
WCDMA vs UMTS is 3G and what you need for voice on 2DM. I thought they were interchangeable terms, but obviously not if your phone has separate settings so it could be worth trying both settings.
GSM (2G) is no longer used by 2DM (but is used still by vodafone).