Oppo
Auto-Reconnect to a Wi-Fi Network auf Oppo
Oppo phones running ColorOS save every Wi-Fi network you connect to and try to rejoin it automatically once it comes back in range. This behavior is controlled by the Automatically reconnect option, which exists separately for each saved network.
It is turned on by default so you never have to tap a network manually again. The downside shows up when a saved network has a weak signal, requires a login page, or blocks internet access after a router reset. In those cases the phone keeps latching onto that network instead of falling back to mobile data.
To change it, go to Tap on Settings ➔ Tap on Wi-Fi ➔ Open the Menu ➔ Enable or disable Automatically reconnect. This setting only applies to the network you have selected, so other saved Wi-Fi connections keep their own behavior untouched.
Turning it off is useful for public hotspots, hotel networks, or any connection you only need once. Turning it back on later brings back the automatic handoff without needing to re-enter a password, since the network stays saved either way.