I have a dumb phone and a relatively new laptop. and yet.
my bank sent me an email explaining that their app will no longer support the Android version for the 9yo smartphone I use as a camera and for the banking app. There is no website with the functionalities of the app (transferring money e.g.)
I replied and said that I am reluctant to buy a device simply so I can do the banking stuff.
Let's see whether they answer at all.
@fritzoids @rachaelspooky you probably don't want to hear this, but it is not safe to do your banking on an old out of support android device. The bank is actually doing you a favor by requiring something newer.
You might be able to get away with a Chromebook. They support android emulation and you can run most android apps on them. If that works, you won't need a smartphone and you'll be able to keep a more familiar laptop interface.