@rockford
Yes I think it’s the best choice for what you are (and me was) looking for.
If you want e/os/, need VoLTE, and really like a small pocket size.
Disadvantage, I can’t find a working GCam app for this phone, only a very old one, V 5.1, that does not work well with the newer e\os.
So picture’s in low light, not so good.
If you are someone who is able to change battery themself, I mean with heating equipment end the right tools, this one is not easy.
It’s a little chubby, 12 mm thickness , S5 S7 around 8 mm.
No Oled display but it’s still looks. good.
And I don’t know which part of the world you live, maybe not available or hard to find.
Another option, if you are willing to use Unofficial e\os\ rom, The Unihertz Atom XL, a very rugged, small, 4,5" screen, device.