Damn this phone is huge and barely fits in my in my pants! I don't think there is much room for a case, but what is thin and light?
It provides what I believe is the minimum level of protection worth having. Before this I went without a case and replaced the glass quarterly-ish. I also take advantage of the mount integrated into the back of the case in the car and on the bike. Cosmetics don't bother me, but I want to reduce the number of times I break the screen.
The screen side is slightly curved as well. If you put a G4 face side down on a table, the edges touch but the glass doesn't.
It's only a 5.5" screen. Mine is 6.3" and uses an otter case.
Don't currently see a reason to get a smaller phone.
Don't carry it around the house like a normal phone.
I got a Caseology for it. Now I see there is a memory card slot on top of the SIM card. I found an unopened 32GB BSD card, but of a slovenly type (~15MB/sec. write-45MB/sec. read).
Is that good enough? From what I read the phone does not allow anything important to be written to the card anyway.