Have you found the ultimate ultralight smartphone? If so, what make/model is it?
Of course, weight is a primary concern. But in my opinion, weight shouldn't be the only (or perhaps most important) concern.
Other concerns are:
*Ability to configure settings for ultra low-power usage
*Option for swapping out batteries
Oh, and definitely nice to have:
*Good screen for watching movies/videos offline while on the airplane.
I don't envision using my smartphone for GPS or hiking apps. Really, once on the trail, the thing is going to be powered off for the duration of the hike.
So far I have found the Samsung Galaxy series (particularly the XCover, SII, SIII and Ace) to fit the bill above. But I am wondering if there are any makes/models that I have overlooked. The Galaxy SIII is incredible, but I think the screen is slightly on the large side. Still, when I watched the Yosemite HD Timelapse video (YouTube), I was quite impressed.