@matigo A bit more enlightened here, it seems. This was copied directly from my latest phone bill: "Includes unlimited calls, SMS & MMS to standard Australian numbers and data to use in Australia."
There was an unexpected change to my mobile allowance: it went from 15 GB per month to 30 GB with no price increase.
It's unclear whether this is a permanent change or a shorter-term WFH COVID19 arrangement.
// @variablepulserate