Before December last year I was on pre paid and the data packs worked fine outside Christchurch. The next time I was outside Christchurch was in January when it no longer would work. Between this time I had switched to pay monthly and had visited Australia using a Virgin Sim in the phone, though not sure if either of these would have affected it. The data still works fine in Christchurch.
I did notice that I was using the APN: http://m.2degreesmobile.co.nz/ and have changed this now to the APN: internet and have data roaming turned on though am not sure if this will help.
Have not contacted 2 degrees yet as am sure I have done something wrong in the settings on the phone.
Any advice would be much appreciated.