Under normal circumstances, if the mobile phone is connected to 5G and WIFI, the mobile phone will give priority to using WIFI to surf the Internet, rather than using the traffic of your mobile phone, but if your WIFI is not able to surf the Internet normally, the mobile phone may automatically select the traffic of the mobile phone to surf the Internet, so pay attention to it when using it, which can also be set. If you have enough traffic, you don't have to worry about that
The priority is definitely WIFI, no mobile network required