I have never tried that on Samsnung, but I got bunch of those for my friend's kids. One for the iPhone and one for the iPad, and they seem to work well.
My friend's son has a very bad vision, which can't be corrected by prescription lens. He places his ipad on a nice stand and attach the zoom lens to the ipad's case, then to photos of the stuff teacher writes on the board.
It works really well.
cheers