OPPO Reno13 FS 5G
It's not possible to use Wi-Fi
Solution 2 of 4: No connection to a Wi-Fi network is established
You can use Wi-Fi as an alternative to the mobile network when establishing an internet connection. This way your phone doesn't use mobile data.
Slide two fingers downwards starting from the top of the screen.
Press the settings icon.
Press Wi-Fi.
Press the indicator next to "Wi-Fi" to turn on the function.
Press the required Wi-Fi network.
Key in the password for the Wi-Fi network and press Save.
Slide your finger upwards starting from the bottom of the screen to return to the home screen.