Forgetting or Removing a WiFi Profile from an iPhone or iPad
Your device saves a profile for each Wi-Fi network you join so it can reconnect automatically in the future. Occasionally, changes to the network or its security settings can cause an older profile to interfere with your connection. Deleting outdated or unused Wi-Fi profiles can help ensure a smooth connection experience.
- Go to Settings.

- Tap on Wi-Fi.
- Tap the Information (i) button to the right of the network you're trying to remove.
- Select Forget This Network.
- The device will prompt you again to make sure. Tap Forget.
In case the above doesn't work, or you're still running into issues with the above method, try the steps below. However, note that the following options may not necessarily show up exactly as displayed below on your iOS device.
- Go to Settings > General.

- Go to Profile (or VPN & Device Management, for newer devices).

- Select the appropriate network configuration profile. It will usually contain the name of the network in the title.

- Tap Remove Profile.

After trying the method above, go back to the top of the page again and see if you are able to Forget Network in Settings this time, or if the networks you've been trying to forget have already been successfully forgotten.