The chapter integrates the conceptual ideas presented in this volume and the outcomes of the empirical research on mobile Europeans’ access to and the portability of social security rights that focused on four pairs of countries (Hungary-Austria, Bulgaria-Germany, Estonia-Sweden, Poland-UK) in four areas of social security (unemployment, family benefits, health, and pensions). In the first step, the chapter identifies country-pair spanning patterns in respect to (1) cross-border social security regulations, (2) discourses of belonging, and (3) mobile (East-)Europeans’ experiences of (unequal) welfare opportunities. At the same time, it puts emphasis on the country-pair specific differences and similarities of the above-mentioned dimensions of European social citizenship.