PhoenixNZ: To the original question:
Why is it you can buy two identical problems and one is faulty while the other is fine? The ChCh RNC is not working the way it should and the Auckland one is. Its not a matter of not enough capasity or anything like that. Its simply faulty equipment in one place and not in another.
Perhaps there are more connections on the christchurch RNC than the auckland one.
From auckland to taupo there could be more people on Vodafone rather than XT..