Increasingly, we use mobile applications and services in our daily life activities, to support our needs for information, communication or leisure. However, user acceptance of a mobile application depends on at least two conditions: the application’s perceived experience, and the appropriateness of the application to the user’s context and needs. Yet, we have a weak understanding of a mobile user’s quality of experience (QoE) and the factors influencing it. In this talk I will present Android phone-users studies, where we collected both QoE and the underlying network’s quality of service measurements through a combination of user, application, and network data on the user’s phones. We aimed to derive and improve the understanding of users’ QoE for a set of widely used mobile applications in users’ natural environments and different daily contexts. We present data acquired in the studies and discuss implications for mobile applications design.