The photosphere attempts I've made aren't nearly that good.
I had the same problem initially. Don't rotate your arms at the shoulder or elbow, it changes the perspective too much. Instead, hold the phone closer to you and rotate the phone while keeping it otherwise stationary (i.e. don't turn your body or arms in any manner while holding it). The more foreground objects you have in the shot, the more strict you have to be on the camera's perspective in each shot.
Just finished adding one of my all-time favorite movies to the library, "Sunshine" (from 2007). Get it and watch it on Blu-Ray. Really. I'm not one to typically dish out "go watch this good movie" recommendations, but this is an exception.. obviously.
Pan's Labyrinth is a favorite movie of mine.. just ripped it. Watched the beginning because I'm ripping different cuts of each movie as well as separate languages. About a minute into it, I realized "I need a girl to watch these movies with. "
Sad, sad moment. Ah well, better pop the next Blu-Ray in.