Through sheer folly I have brought my iphone 6s to "Unavailable" stage by mistyping passcode in excess of the permitted attempts. i have my appke ID but how to use it to re-liven my phone?

I forgot the passcode to open my iPhone 6s which was not in use quite some months. Repeatedly trying several possible numbers I exhausted the permitted number of attempts and now my phone is declared as “iPhone unavailable”. Will some knowledgeable community member guide me in the matter to make my dead phone alive?