system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If people can build their own computers, what is stopping people from building their own smartphones?

I have not put a computer together myself, but my boyfriend recently built me a PC from two old machines and the idea of building a smartphone came to mind.
gpt
Individual components that make up a smartphone are not as easily available or affordable as PC components. They are highly proprietary to each manufacturer and smartphones don't follow a single form factor the way PCs do.