sbiddle: No VoLTE is a deal breaker for me especially with 250+ RCG sites now and 400+ RCG sites within the next year, literally 95% of which have no 3G so you'll have no voice coverage without VoLTE support.
Sadly, buying a NZ-Telco branded phone via the authorised NZ reseller is no guarantee that you'll get VoLTE support either...
Which reminds me, maybe I should go and check via the other thread again...