This paper presents a vector-sum phase shifter for 5G applications at 28 GHz, implemented in a 22 nm FD-SOI CMOS technology. The component is formed by four VGAs which control the amplitude of quadrature and out-of-phase vectors generated on-chip with compact passive structures. A continuous 0°-360° phase control has been demonstrated with an average insertion loss of 9.5 dB at 28 GHz and a minimum RMS error of 0.4 dB and 4° when the power consumption PDC is 11.5 mW. The presented solution achieves the smallest active area while showing comparable performance for the other features against the state of the art.