I got a new iPhone, but sometimes the phone will automatically connect to the public Wi-Fi in the places I have been before. Why? Use iPh

This is because Apple's mobile phone has the function of iTunes automatic synchronization.

Once you log in to Apple ID, all the information on this ID will be synchronized, including SMS, contacts, call history, game progress and so on.

ITunes automatic synchronization is the official way for Apple to download and install applications on iOS devices. Turn on iTunes Auto Sync, which will automatically detect whether the iTunes library is consistent with the application on the iOS device. If not, automatic synchronization will be turned on.