apple has revisions, but doesn't print the version you're getting in any way you can recognize. If you disassemble it, you'll notice that the parts vary. Different cameras, different boards, chips change. I wonder how many iPhones there have been counting revisions. Also, Samsung serves the super low-end, plus has versions that support pens, and they release bleeding-edge devices, for example 5G (Apple hasn't released 5G yet), and their folding phone, which you can now buy, and is surely the most /cyber/ phone out there right now.
I'll check your time.
A nuclear apocalypse is one thing, but have you considered an A.I. apocalypse? For an A.I. apocalypse, learn Teeline shorthand. It's the easiest shorthand to learn, word shapes easy to hide in images, it supports verbatim text (eg if you need to distinguish H from P, write it disjointed), and supports, in normal text, wide variation by its nature. At essence you gain the advantages of chinese or japanese handwriting at defeating derp learning, but actually with advantages over them!!!