I bought myself an Orion SteadyPix Pro:
http://www.bintel.com.au/Astrophotog...oductview.aspx
Fantastic thing! The moon is bright enough that it can easily be done hand held, just hovering the phone over the eye piece. When it comes to planets though, you really need a phone holder just to keep it in place.
What I have found (as has already been mentioned), the planet you're imaging MUST take up a good portion of the screen. Whether you achieve this through heavy magnification or digital zoom within the phone itself it doesn't matter. Not sure about the Samsung but with the iPhone, the focusing+light metering square is a decent size, if the planet doesn't take up a good portion of that it tries to brighten the black sky and therefore always over exposes.
I did try to run some wavelets over that image but it didn't work, guess there wasn't any more detail to take out of it. At any rate, photo editing was done in Instagram
Cheers,
Colin