I received the Apple ID code by SMS in the middle of the night.

Inexplicably received the Apple ID verification code, indicating that someone tried to log in with your Apple ID.

Please modify the login password of Apple ID as soon as possible. Please open the "Settings" application of the mobile phone, and then click the options of "Apple ID, iCloud, iTunes Store, App Store", click the "Password and Security" option after entering, and then click the "Modify Password" button, and then make changes according to the system prompts.