l have locked it, but it cannot be located, l guess it is switched off. there was no password set, but l set one via the webiste thanks to you. but this pw protection can just be overcome by reseting the whole phone and sold on, right?Use these to locate, sign out, lock and/or erase. Then, change your passwords.
https://security.google.com/settings/security/find-your-phone?continue=https://myaccount.google.com/
https://www.google.com/android/devicemanager