I was reading a bit about different phones, and one point that comes up a lot from USA commenters is that people cannot just use any phone they want, it needs to be a specific model supporting their network carrier, especially the network bands.
I live in Europe, this is pretty unknown here, and from what I gather, Asian buyers are also free to use any phone they want.
How come that nothing has ever been made to improve that situation?
They may not be wrong, his phone is about a year or two old so things could have changed since then.
But that said it doesn’t make any sense outside of the VOLTE thing or some other feature that some carrier requires.