You’re must be joking! Look around, if you look past the bitten apple, there are plenty of perfectly capable devices out there for under $300. In fact, I see plenty of people who are on the street corners panhandling AND using a smartphone.
I got an off-lease dell latitude 7400. Tbh, got it for free, but you can snag one on eBay for under $400. i5, 16 Gb ram, got a 1TB drive for $50 on Amazon. Runs Linux very well! I’d go with a light weight is like EndeavourOS or Arch.
EndeavourOS for the win! The speed of Arch Linux without the installation pain! Especially for older hardware?
Gnome online accounts are also in Cinnamon if you like a more traditional desktop paradigm. Using it now on Manjaro. Works well.
Of course you can get a used of refurbished ones for less even Apple. I was referring to new devices. As an example, I use a Motorola Edge plus that I bought new for $400. It does everything my wife’s iPhone 15 Pro. The camera quality is slightly lower, but perfectly adequate.