People are writing this off, but it eventually becomes impossible not to own a smartphone; an expensive device, with an expensive monthly plan, and an absolutely terrible privacy record. Eventually more businesses will require smartphone usage just to use their services. There could even be a time when government services require it.
A landline phone is about the cost of a cheap smartphone, and the landline itself costs about as much as the cheapest cell plans. But you actually don't need either of those. You just need the cheapest Android cellphone or tablet you get, and access to someone's wifi, which is freely available at many coffee shops, or from neighbors. I still agree you shouldn't need it, especially if you already have a computer. But…
So no security updates and any app can stop working any moment. And all your data are at Google, too: https://news.ycombinator.com/item?id=26639261