Where does it end though? A phone in one thing; what about a video game console, or pricey sneakers or brand name clothing from the top streetwear brands?
Rvery day I'm feeling a little more grateful that we had school uniforms where I went. The materialist one-upsmanship was insane even then, but at least for 8 hours/day people weren't walking billboards for "look at how much my parents have spent on me".
They don’t use those things to talk to their friends. Think of how many things are digital-first or digital-only these days. Their phone is how they literally exist among their peers in society. It is non-optional.
May or may not work though. I have a friend that does this, and one of his kids simply cannot save money. So when there's something he knows that they all want, he buys it for all of them rather than make them save for it.