Whether Huawei X3 mobile phones support 5G WiFi depends on the specific model and configuration. In general, if the phone supports 5G WiFi, it will be clearly listed in the phone's manual or specification sheet. At the same time, you can also check your phone's network Settings to see if it supports 5G WiFi.
If you have questions about specific issues with Huawei X3 mobile phones or other devices, you are advised to contact Huawei technical support or official customer service directly, they can provide you with the most accurate and up-to-date information.