Remote for D800
There is the free Helicon Remote Android App for tablets & smartphones you connect the phone to the camera with a OTG USB adaptor & the cameras USB lead.
You can only save jpegs if you want to save raws you have to buy the program costs $48.
I tested it with the D800 & Samsung S3 phone & everything worked.
there is a guy here running this in euro on new sony z phone - says works well...
|IMG_8168ABCD by citori525|
|McKinley meadow by TimR32225|
from Natural meadows
|Flare-well to a Classic Flying Machine by cjf2|
from Flying Machines
|_DSC2146 by jerste|
from Helios-44 II
|Leopoldsteinersee by RaCor|
from Landscape - Colour #3