Security Lockout

There is no other option other than to erase the phone and then set it up again.

Use the article linked above your name to get things going again. Write down any new passwords or passcodes that you set up and keep them in a safe place to avoid the next disaster.

Kids in the house maybe, who tried to get in your phone?

OK.....We can't explain what or why it happened, but you will need to erase your iPhone and set it up again. If you've been backing up regularly, you'll be able to restore your data.