Japan Wi-Fi auto-connect

My device connects to a Wi-Fi, even though I turned off the automatic authentication settings. [iOS version]

In the iOS version, your device will automatically connect to any Wi-Fi service you have connected to before, even if you turn off the automatic authentication settings.
If you turn off automatic authentication, authentication with the Wi-Fi service will not be performed. You can prevent unintentional connection to the internet.

If you do not wish to automatically connect to a specific Wi-Fi, please see the following article.

How to prevent automatic connection to a specific Wi-Fi.