How overcome the issue iPhone not available

looks like you already solved your own issue as you marked the thread solved by your own posts?

If you forgot your iPhone passcode - Apple Support

How to remove your iPhone, iPad, or iPod touch passcode without a computer - Apple Support

This is not a chat service, and is not a way to communicate directly with Apple; it is a user-to-user technical support forum. There is no point in posting the same question over and over and over. If you have a question or issue that you think another user can help you with please describe it in as much detail as you can and a user who sees your request and thinks they can help will answer, but that might not be immediate; it could be hours later. Here is some advice on how to do that effectively→Writing an effective Apple Support Communities post.

If you want to contact Apple use the Get Support link at the top of this page or call Apple by choosing a number from this list→Contact Apple for support and service - Apple Support