Calls for help like this one are becoming more frequent. Someone builds a phone/Arduino project based on a tutorial or kit. It doesn't work and they come to the Arduino or MIT AI forum asking "what's wrong?".
All the elements to make such a project work are well described in many places.
The discussion we are in right now encompasses pretty well all the key points in troubleshooting an app/Arduino problem.
I would like to suggest that anyone wanting to know why their MIT App Inventor app isn't working correctly with their Arduino kit are referred to this discussion. They should only call for help after they have checked off everything in this discussion and still can't get things right.
What do others think about that? Do you not get tired of asking the same questions, making the same suggestions?