4G also reuses the frequencies in the exact same way, the primary difference between 3G and 4G is that 3G used CDMA and did not have the higher modulation desit

4G also reuses the frequencies in the exact same way, the primary difference between 3G and 4G is that 3G used CDMA and did not have the higher modulation desities, (capped at QPSK) while 4G LTE went up to 64QAM, so more bits per symbol. 4G did not use spatial separation, that requires beamforming, that is most certainly not deployed in 4G, 4G LTE uses MIMO. Spatial separation is deployed in 5G but only at the mm-wave bands due to the 1/2 wavelength separation required between antenna elements, hence, impractical with longer wavelengths.