Xiaomi co-founder and president Lin Bin has been taunting other brands (and teasing consumers) with how awesome the Xiaomi Mi Mix 3 is going to be. First the Oppo Find X-like pop-up camera now 5G support. His latest photo shows the phone with its status bar reading "5G". The phone is in front of what appears to be a 5G testing station, "NR5G" refers to to the 5G New Radio standard, which encompass the sub-6GHz and mmWave technologies. The N257 band specifically is in the 28GHz band, so it's mmWave tech (the faster, but shorter range of the two technologies). Qualcomm already has two...
Source: https://www.gsmarena.com/the_xiaomi_mi_mix_3_will_support_5g_networks-news-33073.php
