Huawei Mate X3 supports dual WiFi function, you can follow the following steps to set:
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1. Open Settings: Swipe or press the Home button on the home screen, then tap the Settings icon.
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2. Go to Network and Internet Settings: In the Settings screen, find and click \"Network and Internet\".
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3. Go to WiFi Settings: In the network and Internet Settings page, find and click \"WiFi\".
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4. Enable Dual WiFi function: In the WiFi Settings screen, you will see the \"Dual WiFi\" option. Click on this option to set it up.
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5. Set primary WiFi and secondary WiFi: In the dual WiFi setting interface, you can set primary WiFi and secondary WiFi. Primary WiFi is used for primary network connections, while secondary WiFi is used to provide additional network connections.
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6. Configure auxiliary WiFi: Click the \"Auxiliary WiFi\" option, then select the available WiFi network and connect.
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7. Complete the Settings: After completing the configuration of primary WiFi and secondary WiFi, click the \"Save\" button to save the Settings.
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Note that the dual WiFi feature requires a router or network device that supports dual WiFi. Make sure your router or network device has dual WiFi enabled and follow the device's instructions to set it up.
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The above are the general steps for setting up dual WiFi for Huawei Mate X3, and the actual operation may vary slightly depending on the device. If you encounter problems or need more detailed guidance, refer to the user manual of the device or contact Huawei customer service for help.