Phone, probably in 2012 or 2013: Sony Ericsson W200i.
Proper computer in 2020: (Laptop) eMachines e627. A very slow AMD Athlon 64 powered laptop. It broke after 2 months of use. It’s what got me to Linux. I barely got any understanding of what OS is, less so a difference between Linux and Windows, but I needed one. I found the UI of Windows 10 too complicated, so I went with Linux Mint 20 MATE.
Of course, that is only after learning what “distribution” is.
My ass was trying to find “just Linux”.
Thankfully, it already had Windows installed (used, unclean, untrusted, potentially unsafe to use) and I managed to dig out some DVD-RW which used to have some cartoon on it. Of course I had 0 flash drives.