This paper presents a Reconfigurable Intelligent Metasurface (RIM) with beam-steering capabilities working in the millimeter frequencies and being insensitive, namely supporting a wide range of angles of incidence, up to 75 •. Particle Swarm Optimization (PSO) algorithm is adopted to reconfigure the metasurface according to the desired direction of the reflected main beam. Finally, the interference has been modeled and a system model including a base station, a RIM and a mobile receiver, in presence of interference is considered, and the performances of the system are evaluated through the angle deviations of the obtained main beam, the change of the sidelobe level (SLL) and the accuracy.