I am interested to know which mobile operators in New Zealand support updating handset time/clocks via the network.
According to the Wikipedia page on NITZ (Network Identity and Time Zone), Telecom NZ support this, however no specific information is provided as to whether this is the CDMA network, the UMTS network, or both. Does anyone know if Vodafone or 2degrees support this on their GSM or UMTS networks?
Does anyone have any knowledge (including personal experience or observations) of the accuracy of the network time compared to other time sources, e.g. GPS or NTP?
The reason I ask is that my workmates and I have noticed the times we observe from my wristwatch (set from computer/NTP), my Android phone on Vodafone's network (which presumably uses network time or GPS time) and phones running on Telecom's UMTS network appear to vary by up to a few minutes.