First off apologies if it has already been mentioned. Couldn't find anything about it.
Got mention today of a special offer available for XT users through @TelecomNZ on Twitter. The info is below. Link here: http://store.telecom.co.nz/mobile/special-offers/text-anyone-2500
Text Anyone 2500
2500 Texts to any NZ network for only $12
With Telecom's new Text Anyone 2500™ Text Extra, you get 2500 texts a month that you can use to text anyone on any NZ mobile network for only $12. That's less than 1/2¢ a text* (National person to person texts only).
Just add this Text Extra before 31 July 2010 to your XT plan or XT prepaid mobile and it will be available to you until 31 July 2011, that's at least a year!
If you already have a TXT 150, TXT 600 or TXT 1500 Text Extra but would like to switch to the new $12 Text Anyone 2500™ Text Extra dial *333 from your mobile or change your Extras options online.
*20c per text charge applies once you've used up your included 2500 text allowance per month. Only available on XT prepaid and postpaid plans.