Oppo
Forget a Saved Wi-Fi Network auf Oppo
An Oppo phone remembers every Wi-Fi network you have joined, even after you switch routers or change the password. ColorOS stores these entries in the saved network list, which is why the phone sometimes tries to reconnect to a network that no longer works instead of joining the one you actually want.
If you are still connected to the outdated network, tap the network name directly under Settings ➔ Wi-Fi and choose Remove this network. This works only while the connection is active.
If the network is out of range or was never joined in this session, go to Settings ➔ Wi-Fi ➔ Advanced settings ➔ Saved networks. Tap and hold the entry you want to delete, then confirm with Remove.
Removing a network only deletes the stored password and priority on this device. Other devices on the same network keep their own saved copy, and you can rejoin later by entering the password again. If the phone still auto-connects to an unwanted network afterward, check whether a nearby router is broadcasting under the same name, since ColorOS matches saved entries by network name, not by router.