The iPhone 4 was perfect at 115mm * 59mm and weighing just 137 grams.
The 13 mini was the last bearable iPhone at 132mm * 64mm and 135 grams.
Newer phones are simply too large and clumsy, and difficult to handle with one hand even for me as a grown man with fairly large hands. I don't want a tablet sized phone, I want a fully functioning phone that doesn't feel like a brick in my pocket.
I loved the hardware, but it had some awful "value-added" Motoblur software atop Android that seemed to put Motorola in the loop on Internet communications, where it didn't belong.
And unfortunately the Defy was locked down against alternate firmware. So I got a Samsung i897 Captivate (122.4mm x 64.2mm, 118g), and found a nice alternate firmware Android fork for it.
Currently, after various phones that didn't work as well, or that were creepily invasive (e.g., iPhones, vendor Android), I'm currently using GrapheneOS Android firmware, with Pixel 7 hardware.
Plus a case sufficient to let it likely survive a drop. The result is a bit of a brick, which beats up my trousers pocket, looks dumb, and sometimes causes chafing. I've started experimenting with not carrying a phone at all again, and it's a bit of a relief, though occasionally I miss a photo.
(But it's not the same as walking phone-less before. Everyone and their dog has now set up networked surveillance cameras, feeding centralized data fusion of the current regime. So you're arguably being tracked even more now, phone-less, than when you used to walk around enjoying the benefits of your earlier phone.)
Here's the single search result that appeared:
https://www.gsmarena.com/cubot_kingkong_mini_4-14099.php
Its CPU is comparable to that of my old S8, but the GPU is considerably worse.
This size category actually extends to 70mm, as there are no other vaguely mainstream phones smaller than the Galaxy S25 clocking in at 70.5mm.
Unfortunately, the hardware, software, and interoperability of those Rakuten phones is too limited and outdated.
And a (small) tablet for drawing and videos, it has less constraints in term of size, and can live in my bag.