Sometimes ideas and inspiration just come you. Use your phone to capture those thoughts.
The easiest way to capture ideas is to take a picture. Even if it is not a beautiful photo is can capture the essence as a reference for a stencil or a painting or art process.
Another way I use my phone is to write a note to myself. Then I can come back to the notes later.
A third way that I save inspiration is to record sounds. Sometimes I just want remember that feeling that is created by the crashing waves or babbling brook.
Then turn that inspiration into art making action.