As a semi-geek I define "computer" as a computer that has an operating system that will run whatever software the user chooses to load onto it. IOW a computer is what they used to call a "programmable computer". Non-programmable computers and limited function computers (like a programmable calculator) don't fit the current definition of the word "computer". So a dumb phone is not a computer, it is an electronic device with built-in functions whose settings can be altered but whose processes can't be altered except by reflashing it with a different/updated operating system.
Flashing defined (in case anyone doesn't already know what it means) https://www.techwalla.com/articles/w...ey-are-flashed