Huawei's mobile phone 4G network setting method can be tried according to the following steps: 1, confirm that the 4G calling card has been replaced, and turn on the 4G function; 2. Try to restart the phone; 3. Drag down from the top of the screen (or up from the bottom) to ensure that Move Data is turned on; 4. Set the network mode to 4G priority or turn on the 4G switch (the setting method is divided into the following paths: EMUI4.0 (dual card) entry setting-all settings-more-mobile network-card slot selection-network mode -4G/3G/2G automatic; EMUI3.0 (dual card) entry settings-All settings-More-Mobile network-Select card slot-Preferred network type -4G/3G/2G automatic; EMUI2.0 enters Settings-All Settings-Connection-Mobile Network-Network Mode, and can automatically switch to 4G/3G/2G. ); If you don't set the network mode or you can't use 4G after setting it, it is recommended to change the machine and card for testing.