I was looking for nz and aus minutes and texts at an affordable price with eSIM and VoWiFi when in Australia (so no roaming costs) and was looking at the montly plans here https://www.2degrees.nz/mobile-plans/prepay

but then i went to https://www.2degrees.nz/hellodeals and found the current deals https://www.2degrees.nz/sites/default/files/2025-10/3_Nov-Hello-Deals-A4-Digital.pdf which has different monthly prepaid deals

so if i wanted unlimited minutes on the $15/month pdf deal- how do you buy it online?

if i sign up on the $8/month can i select the $15 next month?

sorry if this is explained elsewhere- my search terms did not find anything about this.