Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4777267.
Remixed from "Hand" by Teak.
I scaled the hand to 18cm (actual size of my hand) and copied a mirror hand and designed both hands to vertically hold my iphonex on desk (it may fit to some other phones based on their sizes). Then I noticed that the thumbs also hold the phone horizantally. So, I later included a base for the hands to stand firmly on the desk, even when the phone stands horizantally on the thumbs without topple. The charger cable (lightenning) passes under the palms very firmly and when the phone is out, it isn't dislodged. So, you can also charge your phone on the hands (with almost hidden cable).
I printed the hands with 0 infill to save filament and mostly time. It works fine for me but if you want to have more dignified holder you can increase infill as you wish.
See the timelapse video (with effects) of my initial print:
Thanks once more to Teak for this accurate hand(s).