At & T “5Ge” marketing, which is still based on 4G LTE-A network, has caused great controversy when 5g commercial network has not been officially launched. However, with the launch of the iPhone 12, Verizon, one of the carrier’s partners, will display the word UW on the corner of the mobile phone signal to help users know whether they are connected to a 5g millimeter wave network. < p > < p > it is reported that 5g is mainly divided into 6 GHz and millimeter wave bands. The former has strong signal coverage and penetration, but the speed is slow, so it is suitable for deployment in the rural areas with a large area and few people. The latter has higher speed but limited signal penetration, so it is more suitable for user intensive urban environment. < p > < p > as for the “UW” corner mark mentioned by Verizon, it is the abbreviation of the carrier’s “ultra wideband” network. In order to help you understand the advantages of the company’s 5g network, we also saw a promotional video given by Chris Rock. < / P > < p > the video confirms that if you use the standard sub 6GHz network currently provided by Verizon, users will only see the normal “5g” signal corner in the upper right corner of the iPhone 12. < / P > < p > in order to take into account the advantages of both below 6GHz and millimeter wave networks, Verizon has also implemented the “dynamic spectrum sharing” (DSS) technology, which improves the customer experience under 4G / 5G hybrid networking by borrowing some low-frequency resources from 4G LTE networks. < / P > < p > finally, Apple introduced in detail the unique features of the iPhone 12 in 5g antenna design at the press conference, so that consumers can safely roam under different 5g network bands in various market regions. Global Tech