1. The iPhone 12 can only connect to 5G WiFi. This is because the Apple 12 uses 5G technology to support faster network speeds and lower latency, so it can only connect to 5G WiFi networks. The reason for this design is to enable users to take full advantage of the 5G capabilities of the Apple 12 and enjoy a faster network experience. At the same time, the coverage of 5G networks is relatively narrow, so the Apple 12 can only connect to 5G WiFi, to ensure that users can get better performance and experience on the network connection.