The document summarizes a presentation given at the Mobile Marketing Research World conference from October 8-11, 2013 in London. The presentation discusses the benefits of longitudinal mobile research panels, which involve repeated observations of consumer behavior over long periods of time. This allows researchers to better understand trends, recall, familiarity with the research process, and speed of insights. Most importantly, longitudinal research enables analyzing the entire consumer journey from purchase to usage to satisfaction to future considerations and loyalty. This level of insights can help marketers influence consumer decisions at each stage. However, longitudinal research also faces challenges related to participant compliance, avoiding bias, costs, and ongoing panel management.