Could see any other forum that seemed to fit the subject.
I have an Optus SIM that I use when I go to Ozz and also use it for password resets at work as our parent company will not send password reset SMS to NZ cell numbers .
The reason I chose an Optus SIM was that they lasted 6 months just by putting $10 on it every 6 months. Got a SMS today saying that all topups from $10 to 25 only last only 30 days and you will have to add $30 to it to get 6 months. Now Optus seem to have joined the other Ozzy carriers in going to 30 SIM expiry plans..
Glad NZ carriers haven't done the same and have stayed at 12 month.