Can mmWave go through walls?

5G Ultra Wideband compatible phones, like the new Samsung Galaxy S20 5G UW which Verizon announced yesterday, will be able to seamlessly transfer from mmWave networks outside to the network indoors .

mmWave doesn’t penetrate walls Most building materials, such as cement and brick, attenuate and reflect very high-frequency signals with a big enough loss you’re unlikely to receive a very useful signal moving from inside to outside.18 Ağu 2021

Ultra-high bandwidth availble in mmWave spectrum enables massive throughput, while wider subcarrier spacing can improve critical realtime IoT latency. However, indoors, propagation will be limited to open areas with limited penetration through interior walls .