This is a huge deal for me. I am looking at pairing Freedom's $99/year prepaid service with an great data only service like the Walmart/ATT plan and see if i can get the best of both worlds.
I haven't owned an iphone in years, but this is making me want to get the iphone 12 when it comes out. Seriously tempted now, but there are a couple of things I have always taken for granted on Android that i will sorely miss. Windows-like file access/data transfer, youtube vanced, non-DRM media ... Gosh, i will miss Android.
EDIT: This feature is called"Cellular Data Switching"