We are witnessing an acceleration of the deployment of digital technologies in border regimes as well as in migratory practices. This does not necessarily make borders ‘smarter’, but it points to spiraling dynamics between border and migration practices to which digital technologies prove central. Technologies deployed by European countries to manage the so-called “refugee crisis” – from fences to the Eurosur drone system – have their reverse side. While digital networks facilitate surveillance systems, they also foster mobility and challenge border regimes at the same time. Persisting migration in defiance of ever more sophisticated border technologies demonstrate the possible detour of control systems. In our fourth issue of spheres, we investigate the significance of digital technologies for migration and the relation between migratory regimes and practices on the one hand, and digital cultures and infrastructures on the other.