1.iPhone 6 plus (model: A 1524) supports Unicom's 4G network. The setting and usage of 4G network are as follows: 1. Mobile phone charges must be Unicom's 4G package charges; 2. The specific setting mode of the mobile phone terminal is as follows: (1) Turn on the mobile phone setting function and turn on the cellular mobile network; (2) Open "Cellular Mobile Data" and click "Cellular Mobile Data Option"; (3) Set voice and data-select "4G" to open the 4G network. Tips: 1. Unicom's 4G network can only be used if the signal of Unicom's 4G network is covered. If there is no 4G network coverage, China Unicom's 3G and 2G networks can be used for backward compatibility. 2. Network signals will be influenced by many factors such as topography, landforms, tall buildings and climate. 3. You can call Apple's official customer service to find out which models of Apple terminals support the network.