I still don’t get it. Most of phone numbers start with +. Yet it’s supper annoying to type by holding the 0. There’s clearly lots of free space on a screen. Make a separate button? What? They don’t make a nice rectangle that way? Well who cares
You might say: why use plus at all? It’s only required for international calls, right? Local ones start with 0, 8 or whatever your country uses? Well, I find that idea strange too: phone numbers that only work when you are in a specific place in the world. Travel to another country? All of them stop working at once.
No, phone numbers should not depend on your localtion, that’s insane. They should be unique and stable. But that requires + in front