Yeah, AU resident here and my phone (the cheapest possible thing I could buy at the time) is "too old" (less than 5 years!) to run the mygovid app (it barely ran the Covid login one), and I do really feel the squeeze from many directions to upgrade my phone.
I'm also rural, and I feel like this push is being largely driven by people who can regularly afford new phones and upgrade to the latest thing, and who live in cities with excellent reception.