Typically, personal inquiry learning involves active exploration of an open question, with the student taking ownership of the inquiry process. Mobile phones can become inquiry toolkits. A typical inquiry might start in a formal setting, with a tutor helping students to refine their questions, continue at home or outdoors with the students collecting and viewing data, then return to the formal setting to share and present results. Inquiry learning can extend existing online or classroom learning. It also has the potential to catalyse citizen science experimentation.