Hello DudesMa,
Welcome to the Apple Support Communities!
It looks like you joined the Apple Support Communities from an excellent starting point; If you see an iPhone or iPad unavailable message or Security Lockout screen - Apple Support. If your iPhone has reached the point where it is showing that it is locked out, you would need to reset the device.
If you make regular backups of your device you are restore the device from a backup. The steps you follow will depend on how the potential backup was done. Check out the information on this page to learn how to restore your iPhone from a backup: Restore your iPhone, iPad, or iPod touch from a backup - Apple Support.
We hope this information helps you out.
Kind regards!