Apple intentionally makes iPhone-Android interoperability crap in order to sell iPhones. That’s not conspiracy theorizing, Tim Apple blatantly admitted to it.
https://www.theverge.com/2022/9/7/23342243/tim-cook-apple-rcs-imessage-android-iphone-compatibility
But they told me I can just not connect it to the internet and it’ll be just like any dumb device.
Eventually these things will come with modems built in so you can’t even do that.