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I'm currently touring New Zealand using the 2degrees travel sims from a previous deal. I received 1.25gb of data per SIM which I used fairly quickly.
Anyway if you download the Data Clock app you're able to get two 12 hours of free unlimited mobile data.
If you purchased more than one travel SIM you can also "invite" each to the app for an additional 5 hours of free data.
Download Data Clock App
https://play.google.com/store/apps/details?id=nz.co.twodegre…
https://itunes.apple.com/nz/app/2degrees/id1203636332?mt=8
NZBargain ?