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A guy in local hackerspace is building just that: https://hackaday.io/project/19035-zerophone-a-raspberry-pi-s...

Fairphone offer the reverse. A phone that is designed to be repaired by the end user.

Depending on what you're thinking of when you say "phone", you can do that. 3G modem, controller (either a microcontroller like Arduino or one of the smaller Linux-based ARM computers), various LCD options, and either touch or buttons for input. People have built variations on that.

Here's an example using a Raspberry Pi, touchscreen, and custom-written UI: https://www.raspberrypi.org/blog/tytelli-a-diy-smartphone/

Do wonder how it would look if we replaced the B with that new Zero W.

Put a smaller GPIO connection on the screen, and you could probably make it 1/3 the thickness of the original one. Still much more powerful than my first Android phone, and you could set it up with much quicker software. Actually getting to feature parity even with most feature phones would take some serious work, though.