If you're using plaincode's Clinometer application for iPhone, there's a button at the top of the level screen ... "Calibrate." You'll get more desirable results using your phone as a level if you calibrate your phone with a real physical level tool. (You may have to re-calibrate every time you upgrade your device. I know I have.)
I managed to get away for the first several years of the 21st century without carrying a cell phone, though I wore an alphanumeric pager until about 2004. Then, at a time when my occupation was teaching the use of, troubleshooting and repairing personal computers, I received an iPhone as a gift from my employer right at the time they were released mid-2007. I've upgraded a number of times since; iPhone's become something of a Swiss Army knife to me. It's taken over the duties of the daily planner, the Rolodex, the travel alarm clock, pocket watch, calculator (even scientific in landscape mode), world atlas, camera and photo album, penlight, egg timer, voice recorder, portable audio player, music synthesizer, clinometer and dog whistle. It's also become a pocket encyclopedia, providing me with access (for better or worse) to an interface-rich Internet.
Oh, yeah ... it's a pretty decent cell phone. I can video conference with it, like Dr. Heywood had to go to a pay booth to do in 2001: A Space Odyssey.
Though I respect the virtual virtues (heh heh) of the push button flip-phone, and I still harbor fond memories of getting three touch-tone Trimline extensions on a private line year ago, I strongly recommend to folks who can afford a decent plan to carry a smart phone (iPhone's my flavor of choice, though I have enough experience with various versions of Android to know it works pretty darned well). Even if you're a slow study with tech toys, you'll play with it over the months, and learn that it can be a very helpful and fun tool.
Just don't become completely dependent on it. :wink: