Heads up, I just received an email from Amaysim, saying they are increasing their old $10/28 days plan to $15. Note this isn't a current plan, they stopped selling it a while back, but plenty of people are still on it.
So for everyone who was hoping their plan had been "grandfathered" forever, as I was, sorry to bring the bad news.
Here's the full text of the email:
Russ,
We are always looking to deliver exceptional value for our customers and are continually evolving to bring you the best of our service. From time to time, this means making changes to our plans.
On your next renewal date after 22 February (or the one after that, based on our system timings), your $10 plan will automatically change to $15 with 18GB of data ongoing. That's an additional 14GB more! With this change comes a price increase of $5 a renewal.
You'll Get More Data
Once your plan has upgraded, you'll get 14GB more than your current plan!
— End of email —
So for anyone who doesn't need the extra data, it may be time to move to a different provider.
Alternative providers I've found so far, with unlimited calls+SMS+MMS, at $10/month or less:
$10/month with Dodo Mobile, with 2GB of data, on the Optus network.
$9.90/month with FlipConnect, with 3GB of data, on the Optus network.
$120/year (=$10/month) with Kogan Mobile's "small" 365-day plan, with 120GB of data (=10GB/month), on the Vodafone network.
$9.90/month with CMobile on their smallest "Red" plan, with 1GB of data, on the Vodafone network. Introductory discount of $2/mth (=$7.90) for 6 mths.
There are probably other providers and plans, if you list them below, please mention if the pricing is an introductory offer, and give the ongoing price.
Same with woolworths. My $20 plan is now going up to $25, but comes with another 10 gig so I'm happy