Comment by astrobe_

> And there isn't really just one thing that gets outdated on phones. You usually want a better screen, better camera, better CPU, more ram, new battery.

I can't help but notice that you don't mention the part that makes it a phone (e.g. the 2G/5G/Wifi modem chip). Maybe one should actually sell those as cartridges... Nevermind, that would be a PC-Card.