Activation problem Apple iPhone 5
Activation problem Apple iPhone 5; today, after logging in, I unexpectedly find the following (translated) message "Momentarily this phone is connected with an Apple ID. Log in with the Apple ID which you used configuring this iPhone". Since I forgot or rather misplaced the neccessary input, I can't use the phone. It than says "Apple ID inactive. Your Apple ID has been deactivated for security reasons. Enter your (new) password using our website applaid.apple.com to reactivate your account". However, all efforts remain unsuccessful, who can help?
iPhone 5