Vodafone Prepaid Plus plans costing between $30 and $60 for 28 days feature 'infinite data,' so when users have got through their quota for the month as well as any data 'banked' from previous periods, they will still be able to connect at 1.5Mbps.

That's pretty slow by today's standards, but it's fast enough to check in at a venue under COVID arrangements, keep up with social media, and listen to streamed music, for example.

$30 buys 15GB of full-speed data, unlimited national calls and SMSes, 500 minutes to Zone 1 countries and 50 standard international SMSes.

The $40 plan boosts that to 30GB plus 1000 international minutes to Zone 1 and 100 to Zone 2. Paying another $10 gets you 45GB, 1500 Zone 1 minutes and 200 Zone 2 minutes.

The Prepaid Plus plans with infinite data top out at $60 for 60GB, 2000 Zone 1 minutes and 250 Zone 2 minutes.

Up to 200GB of unused data can be banked for future use providing you recharge before expiry.

An introductory offer giving extra data on the first three recharges within 90 days of activation. That takes the quotas to 40GB for $30, 50GB for $40, 60GB for $50 and 70GB for $60.

Automatic recharging attracts a $5 discount on $30 and higher plans.

"Our new Prepaid Plus range is giving Australian prepaid customers better value than ever before by allowing them to keep using data at no extra cost before their next recharge," said Vodafone chief customer officer Ana Bordeianu.

"The new Prepaid Plus plans not only offer generous data and great features like Data Bank, but we are ensuring that prepaid customers now get the great benefits of infinite data at speeds of up to 1.5Mbps on selected Prepaid Plus plans. With huge, included data allowances too, our customers have the freedom to use their phones without worrying about their data."

Some Prepaid Plus plans do not include infinite data or international minutes. They are the $10/4GB/7 day, $20/8GB/14 day, $150/80GB/185 day, and $250/150GB/365 day plans. That's such a significant difference that you may wonder why they are all being sold under the same name.