Explore a 23-minute conference talk that delves into the analysis of unrestricted touchscreen interaction on smartphones in real-world settings. Gain insights from in-the-wild studies conducted using two different apps deployed in the Android App Store. Compare the findings with previous research on comfortable interaction areas and discover how they align with proposed models. Learn about the "sweet spot" - the position most frequently touched when input can be performed anywhere on the screen. Examine factors such as thumb reach ability, ergonomics, phone size, user posture, and back-of-device interactions. Understand the implications for graphical user interface design and free interaction patterns. Investigate data collected from popular games like Flappy Bird and analyze device size trends. Conclude with key findings that can inform the development of more user-friendly touchscreen interfaces for smartphones.